Bapi doubt ...difference rfc and bapi

Plese give me the following information.
1) wt is the difference between BAPIRETURN, BAPIRET1 and BAPIRET2?
2) wt is the diff. between an RFC-enabled fm and BAPI ?

Hi again,
1. YES, Definitely it will behave like BAPI.
2. The sap concept of
   naming function modules (related to business object)
   and naming them as BAPI*
   is JUST FOR IDENTIFIECATION PURPOSE,
           and nothing else.
We can give ANY NAME.
regards,
amit m.
Message was edited by: Amit Mittal

Similar Messages

RFC AND BAPI

Hi,
Difference b/w the BAPI and RFC.

Dear Bhagavan,
Go through the following threads
BAPI and RFC
What is the difference between RFC and BAPI?.
RFC AND BAPI
BAPI& RFC
Best Regards,
Srikanth
Reward the useful answers and you will get
ONEPOINTyourself

About RFC and BAPI

Hello Masters,
What Makes the exact difference between RFC and BAPIs. Both can perfom same thing. BAPI uses the RFCs only. Then how can it justify?
Thank you

RFC:
RFC --- > Function module and general will be used to make call to function
sending the function (XI has RFC adapter)
BAPI:
BAPI ---> Other version of RFC (Objected oriented) mostly we will use for Sync
calls (Mostly in XI using proxies we will call BAPI's)
Refer these links for more details:
http://sapabap.iespana.es/sapabap/sap/faq/ale_idocs_bapi.htm
http://www.sap-img.com/fu033.htm
BAPI Vs IDOC - in detail
http://searchsap.techtarget.com/tip/1,289483,sid21_gci824860,00.html
/thread/127699 [original link is broken]
IDOC,RFC,BAPI
Re: When and Why we use BAPI, RFC and IDOC.. in XI
Diff... between ALE, IDOC, RFC, BAPI, BADI --- Not clear and clarify
idoc and bapi
Difference among IDOCS,BAPI,RFC?
http://searchsap.techtarget.com/ateQuestionNResponse/0,289625,sid21_cid558752_tax293481,00.html
Differences Between RFC & BAPIS
RFC Vs BAPI
For more details:
refer this thread.
What are idocs, BAPI, RFC?
BAPI is nothing but the Business process programing interface which are standard and stable and these are store in the business object repository.
Standardized programming interface that enables external applications to access business processes and data in an SAP System
RFC is the remote function call which is used to call the function remotely which may be in same system or ather system
its also used communication between SAP systems , between SAP systems ,external systems.
idoc and bapi
Difference among IDOCS,BAPI,RFC?
http://searchsap.techtarget.com/ateQuestionNResponse/0,289625,sid21_cid558752_tax293481,00.html
Differences Between RFC & BAPIS
RFC Vs BAPI
http://www.sap-img.com/abap/ale-bapi.htm
RFC means remote function call,
these are the function modules which can help u to access across the sap and from sap to third party front end,
BAPI means Business application programing interface which is the RFC enable function module and uses in OOPS concept.
RFC ,IDoc and BAPI
ALE/ IDOC
http://help.sap.com/saphelp_erp2004/helpdata/en/dc/6b835943d711d1893e0000e8323c4f/content.htm
http://www.sapgenie.com/sapgenie/docs/ale_scenario_development_procedure.doc
http://edocs.bea.com/elink/adapter/r3/userhtm/ale.htm#1008419
http://www.netweaverguru.com/EDI/HTML/IDocBook.htm
http://www.sapgenie.com/sapedi/index.htm
http://www.sappoint.com/abap/ale.pdf
http://www.sappoint.com/abap/ale2.pdf
http://www.sapgenie.com/sapedi/idoc_abap.htm
http://help.sap.com/saphelp_erp2005/helpdata/en/0b/2a60bb507d11d18ee90000e8366fc2/frameset.htm
http://help.sap.com/saphelp_erp2005/helpdata/en/78/217da751ce11d189570000e829fbbd/frameset.htm
http://www.allsaplinks.com/idoc_sample.html
http://www.sappoint.com/abap.html
http://www.sap-img.com/abap/interview-question-on-bapi-rfc-abap-objects-tables.htm
This is a short description of BAPI and RFC
BAPI stands for Business Application Programming Interface. It is a library of functions that are released to the public as an interface into an existing SAP system from an external system.
RFC is the protocol used to call functions in an R/3 system by a caller external to R/3 or to call programs external to R/3 from an R/3 system.

Unable to differentiate between RFC and BAPI

Hi guys,
    Nowadays I am studying the above concepts:BAPI and RFC. But I am confused by the two.
So far I learnt that the two are both techniques used to realize communication between SAP and external
systems,and frequently via Remote-enabled Function.
   My confusion is the distinctions between the two. Would you please do me a favor? Tks

Hi   Alex,
Just check it out these answers.
Remote Function Call :
RFC is an SAP interface protocol. Based on CPI-C, it considerably simplifies the programming of communication processes between systems.
RFCs enable you to call and execute predefined functions in a remote system - or even in the same system.
RFCs manage the communication process, parameter transfer and error handling.
http://help.sap.com/saphelp_47x200/helpdata/en/22/042860488911d189490000e829fbbd/frameset.htm.
BAPI
BAPI stands for Business API(Application Program Interface).
A BAPI is remotely enabled function module
ie it can be invoked from remote programs like standalone JAVA programs, web interface etc..
You can make your function module remotely enabled in attributes of Function module but
A BAPI are standard SAP function modules provided by SAP for remote access.
Also they are part of Businees Objest Repository(BOR).
BAPI are RFC enabled function modules. the difference between RFc and BAPI are business objects.
You create business objects and those are then registered in your BOR (Business Object Repository)
which can be accessed outside the SAP system by using some other applications (Non-SAP) such as VB or JAVA.
In this case u only specify the business object and its method from external system
in BAPI there is no direct system call. while RFC are direct system call.
Some BAPIs provide basic functions and can be used for most SAP business object types.
These BAPIs should be implemented the same for all business object types.
Standardized BAPIs are easier to use and prevent users having to deal with a number of different BAPIs.
Whenever possible, a standardized BAPI must be used in preference to an individual BAPI.
another points,
BAPI is object oriented. It is placed under Business objects as methods.
RFC is just a Function module or a call.
RFC: is just a FM that can be called from remote system too(destination defined in transaction SM59).
BAPI: Business Application Programming Interface
A BAPI is a method of a business object defined in the Business Object Repository (BOR). For example, in the BOR, you can find a business object called SalesOrder, which conceptually represents a sales order in the system. A business object typically has several methods that can be used to read, create, modify a particular instance of the business object, or list instances of the business object matching certain selection criteria. These methods are BAPIs.
Technically, a BAPI is implemented using a RFM. But, unlike the non-BAPI RFMs, a BAPI is usually well documented, has nicer parameter names, and is supported by SAP for several SAP software releases. You can browse Business objects and BAPIs in the SAP system using transaction BAPI.
Thanks
Eshwar
*Rewards if useful*

Aout RFC and BAPI

Hi Eperts,
Would you please tell me the difference between the two,because I learnt that BAPI is a kind of RFC,I'm not sure whether it is right or not.

Hi,
RFC Vs BAPI
BAPI are RFC enabled function modules. the difference between RFc and BAPI are business objects. You create business objects and those are then registered in your BOR (Business Object Repository) which can be accessed outside the SAP system by using some other applications (Non-SAP) such as VB or JAVA.
In this case you only specify the business object and its method from external system in BAPI there is no direct system call. while RFC are direct system call Some BAPIs provide basic functions and can be used for most SAP business object types. These BAPIs should be implemented the same for all business object types. Standardized BAPIs are easier to use and prevent users having to deal with a number of different BAPIs. Whenever possible, a standardized BAPI must be used in preference to an individual BAPI. It is not possible to connect SAP to Non-SAP systems to retrieve data using RFC alone. RFC can acces the SAP from outside only through BAPI and same is for vice versa access.
RFC is the protocol used by SAP for remote communication, that is, for communications between remote (independent) systems. RFC is used for communications between two independent SAP systems, or for communications between an SAP system and a non-SAP system, such as an external application. It can also be used for communications between modules on the same system. Using the RFC interfaces you can extend the functionality of R/3 applications from an external program.
Reward if it useful...
Lakshmi.

Are all RFCs and BAPIs automatically exposed as web services?

Hello,
Our product helps business users exchange data with SAP. We use standard RFCs and BAPIs to communicate with SAP. This is a .NET application although my question is not specific to .NET.
It seems SAP obsolete their .NET connector in near future. The emphasis is on web services. This is a great move. We can simply drop using the .NET connector and start using the web services. However, I have a few doubts:
1. RFCs and BAPIs are automatically exposed for remoting. When the customer installs our application, it just works out of the box. Customers do not have to make any configuration changes to SAP to expose RFCs and BAPIs.
In the new world, are all RFCs and BAPIs automatically exposed as web services or one has to go through each RFC/BAPI and expose it explicitly?
2. Is there a comprehensive WSDL schema available anywhere for all the RFCs/BAPIs?
3. Are there any other web services (besides RFCs/BAPIs) that SAP Netweaver exposes? Where can I get more information?
Thank you in advance for your help.
Regards,
Pradeep

Darryl,
Thank you for your help or at least trying to help me. However, you left me with more questions than answers:-(.
1. "Old" does not mean "bad." Each RFC/BAPI serves a specific function. If some RFC is being obsoleted, there must be a replacement documented somewhere. Is there one?
2. I can look into SE80 (and other transactions) to see what is exposed. However, what I need to understand is what is SAP's stance on exposing standard web services.
Can others please share your thoughts?
Regards,
Pradeep

WAD Call RFC and BAPI

Dear all,
I have a problem about using WAD call RFC and BAPI get BW data,who can help me?

HI Bill,
Please give details of what you are trying to do.
Brian

Preference between rfc and bapi

Hi
If rfc and bapi are available for the similar task to implement ...........as a XI consultant which one you will suggest ?? If so could you please explain me the reason for the same ??
thanks
kumar

Hi,
From an XI Implementation perspective,
BAPI's do not have a implict COMMIT associated with them and so , in the receiver RFC adapter you need to provide the COMMIT HANDLING FOR BAPI CALLS. This option was avilable from SP 14.
Prior to that you had to writter a warpper RFC and import it into XI and use this instead of the BAPI.
The RFC's conatin an Implicit commit so no such issue here.
regards
Bhavesh

Exception handling in rfcs and bapis

exception handling in rfcs and bapis

Hi Jayakrishna,
In General , there are non execptions in BAPIs, because of the reason, that the exception raised in a SAP envoronment may not mean anything for a non SAP initiator. All the exception situations would only fill the return table(TYpe BAPIRET2 or something like that). If you read that table after the call to the bapi, you can understand what has gone wrong.
Regards,
Ravi

What is BAPI?How to create a BAPI? Difference b/w BAPI and BDC

Hi all,
Can some one help me regarding...
What is an BAPI?where it is used?
How to create a BAPI?
What is the difference between BAPI and BDC Program?
Iam in Initial stage regarding BAPI concept.
Please respond me soon.
Thanks,
Lee

HI,
Here it is:
BAPI Programming Guide
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/CABFABAPIREF/CABFABAPIPG.pdf
BAPI User Guide
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/BCMIDAPII/CABFAAPIINTRO.pdf
http://techrepublic.com.com/5100-6329-1051160.html#
http://www.sap-img.com/bapi.htm
http://www.sap-img.com/abap/bapi-conventions.htm
http://www.sappoint.com/abap/bapiintro.pdf
http://ifr.sap.com/catalog/query.asp
STEP BY STEP for BAPI
http://sap-img.com/abap/bapi-step-by-step-guidance.htm
<b>DIFFERENCE between BAPI and BDC</b>
BDC is traditional way of coding the transactions for uploading the legacy data, Sap is changing all transactions to Object oriented programming. Since BAPI is Object based and supports all the new transactions it is preffered over BDC. More over BAPI's process data faster than BDC.
BAPI is a SAP-supplied function module with a defined interface, which allows you to interact with various business objects. SAP guarantees the integrity of your database for anything updated using a BAPI. BDC is a method of driving screens programatically, for updating SAP data. BAPIs are generally faster than BDCs.
A BAPI is faster because it is updating the DB "directly". Whereas BDC with call
transaction goes through the whole screen sequence like any user would do, simply put, fills screens.
However - there is not always a BAPI for a particular transaction and not all functions that are performed by a transaction can be done by a BAPI. BDCs produce error sessions which can be processed by the user, while BAPIs don't.
First choose the BAPI ,if there is no BAPI go for BDC.
why BAPI first not BDC.
SAP comes up with Change in Version, so each and every time they will change the screens/number etc.
so you have to change your BDC programs accordingly.
and also Most of the Latest versions transactions are Enjoy Transaction. they will not support BDC's in Background.
But Using BAPI's No such disadvantages.
A BAPI is faster because it is updating the DB "directly" through ABAP code.
A BDC with call transaction goes through the whole screen sequence like any user would do, simply put, it is filling screens.
Actually it depends on your requirement but BAPI is more effective as it is standard function module to update SAP databases rather than BDC.
using bdc over bapi has advantages and also disadvantages
advantages:
1. using bdc we can upload data into database tables using 2 ways
1. foreground -
means that user interaction is there for each and every record.
2. back ground -
no user interaction and tasks are done automatically.
using these two options is one of the greatest advantage over bapi.
2. in bdc call transaction method we can control the display of screen resolution which is not possible with bapi's
3. bdc is generally used for transferring of large amount of data than bapi's
4.session method of bdc allows us to place data directly in application server and then finally transfered into sap database tables
disadvantages:
1.bdc is only used for sap to sap system data transferring
2. bapis's generally works more faster than bdc's
3. using bapis we can connect to remote systems and also to non sap systems.
if useful reward some points.
A BAPI is a method of a SAP Business Object. BAPI enables SAP and third party applications to interact and integrate
with each other at the Business Object / Process level.
Check this link to know more about BAPI.
http://www.sapgenie.com/abap/bapi/example.htm
http://sappoint.com/abap/
Batch Data Communication (BDC) is the oldest batch interfacing technique that SAP provided since the early versions of R/3. BDC is not a
typical integration tool, in the sense that, it can be only be used for uploading data into R/3 and so it is not bi-directional.
BDC works on the principle of simulating user input for transactional screen, via an ABAP program. Typically the input comes in the form
of a flat file. The ABAP program reads this file and formats the input data screen by screen into an internal table (BDCDATA). The
transaction is then started using this internal table as the input and executed in the background.
In Call Transaction, the transactions are triggered at the time of processing itself and so the ABAP program must do the error handling.
It can also be used for real-time interfaces and custom error handling & logging features. .
To know more about BDC,
check the link.
http://sappoint.com/abap/
Main differences are...
In case of bdc data transfer takes place from flat file into sap system ie the file existing in sap system to sap sytem
where is bapi's r remotly enabled function modules which are assigned to some business objects n used to transfer the data between different business partners who are using different systems other than sap.
not only that...
when you plan to upgrade your system version then bdc willnot support those upgradations where as bapi's will support.
<b><REMOVED BY MODERATOR></b>
Manish
Message was edited by:
Alvaro Tejada Galindo

Doubt on IDoc and BAPI

Hi Experts,
I doing Idoc to file scenario, my question is when we go ahead to use IDOC or BAPI. please give me some basic understanding of when and how you use IDoc?
When to use BAPI?
Please provide some links of document
Regards,
Venkatesh

Hi,
when u want asynchronous communication u have to use IDOCS
when u want to use synchrnous communciation and want to communicate external langauges u have to use BAPIS
For File to IDOC,
in R/3
1.create rfc connection using sm59
2.create Logical sys using bd54
3.create port using we21
4.create partner profile using we20
in xi
1.create rfc connection using sm59
2.create Logical sys using bd54
3.create port using IDX!
for IDOC to FIle
R/3 side
1.create rfc connection using sm59
2.create Logical sys using bd54
3.create port using we21
4.create partner profile using we20
5.distribute busynessmodel using bd64
for xi side
1.create rfc connection using sm59
2.create Logical sys using bd54
3.create port using IDX!
4.create partner profile using we20
ALE configuration for pushing idocs from SAP to XI
/people/swaroopa.vishwanath/blog/2007/01/22/ale-configuration-for-pushing-idocs-from-sap-to-xi
IDOC testing using WE19
/people/sameer.shadab/blog/2005/07/25/reposting-idocs-instead-of-recreating--for-testing-purpose-xi
File To IDOC - Part1 (SLD and Design):
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/profile/2007/05/11/fileToIDOC&
File To IDOC - Part2 (Configuration):
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/profile/2007/05/11/fileToIDOC-Part2+(Configuration)&
File To IDOC - Part3 (Steps required in XI and R3):
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/profile/2007/05/11/fileToIDOC-Part3(StepsrequiredinXIandR3)&
SAP R/3
R/3 to XI
1) RFC Destination (SM59)
a) Choose create.
b) Specify the name of the RFC destination
c) Select connection type as 3 and save
d) In the technical settings tab enter the details SAP SID/URL and system number#.
e) Enter the Gateway host as same details above SID/URL.
f) Gateway service is 3300+system number#.
g) In the Logon /Security tab, enter the client user & Password details of Destination system.
h) Test the connection and remote logon.
2) Create Port (We21)
a) First Select Transactional RFC and then click create button
b) Enter the destination port name as SAP+SID (The starting char should be SAP)
c) Enter the destination client.
d) Enter the RFC Destination created in SAP R/3 towards other system.
e) Save
3) Create Partner Profile (WE20)
a) Create New
b) Create the Partner no. name as same the logical system name of the destination system.
c) Select Partner type LS
d) Enter details for Type: US/USER, Agent, and Lang.
e) Click on the + button to select the message type.
f) Select Partner no. and LS which ever create above.
g) Select Message type
h) Select Process code related to the Message type.
I) save.
XI to R/3
1) RFC Destination (SM59)
a) Choose create.
b) Specify the name of the RFC destination
c) Select connection type as 3 and save
d) In the technical settings tab enter the details SAP SID/URL and system number#.
e) Enter the Gateway host as same details above SID/URL.
f) Gateway service is 3300+system number#.
g) In the Logon /Security tab, enter the client user & Password details of Destination system.
h) Test the connection and remote logon.
2) Create Port (IDX1) ( Create port to get IDOC Meta data from sender system)
a) Select create new button
b) Enter the port name as SAP+SID (The starting char should be SAP)
c) Enter the destination client.
d) Enter the RFC Destination created in SAP R/3 towards other system.
e) Save
3) Load Meta Data for IDOC (IDX2) (To maintain IDOC Metadata, it is needed by XI because XI needs to construct IDOC-XML from IDOC. It is not needed by any sap system).
a) Create new
b) IDOC Message Type
c) Enter port created in IDX1.
Edited by: krishnachitanya siddavattam on Mar 7, 2008 5:37 AM

Can you read Reports and Tables through RFCs and BAPIS?

Is there any way to read established reports and tables through RFC or BAPI function calls? We have a middleware that can execute various BAPIs and RFCs. I see a few promising ones: RFC_READ_REPORT, but no examples anywhere what the parameters needed are for the inputs.

Hello Scott,
Check below FMs for reading tables and programs.
Tables : RFC_READ_TABLE
Program : RFC_READ_DEVELOPMENT_OBJECT
Please note that for reading program using RFC_READ_DEVELOPMENT_OBJECT , lines in program should not exceed 72 chars else FM will throw dump(READ_REPORT_LINE_TOO_LONG).
Program code will appear in table QTAB which is 72 chars wide.

Accessing RFCs and BAPIs from enterprise java beans

Hello folks,
     my question is concerning comunication between EJBs and RFCs. I want to develop a simple session bean that connects to a R/3 back-end, calls a RFC then returns some data, let's say, an example of this could be a list of employees from BAPI_EMPLOYEE_GETDATA.
     Ok, by using a web dynpro and adaptive RFC my works could be very very easy, but I'd like to test this way: session (stateless) EJB -> RFC. Can I:
*     use JCO.ClientService with a non-portal SAP WAS?
*     use embedded JRA (SAP Library stated "The SAP JRA is an add-on for the SAP JCo. If you use      the SAP Web AS, the SAP JRA is installed automatically with the SAP JCo.", but I found      nothing so in Connector Container Service ...)
*     install and configure JRA by myself?
I'm working on a SAP WAS 6.40 Sneak Preview (Java only), and finding a path for easily integrate SAP WAS developed ejbs and external business system. SAP Library suggest to "obtain the JCo connection through the connection framework": is it related to JRA, JCA and SAP Resource Adapter?
Thank you
Pasquale

hello
i´ve written a simple stand alone client to test jra connection to a sap system
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Properties;
import javax.resource.cci.Connection;
import javax.resource.cci.ConnectionFactory;
import javax.resource.cci.Interaction;
import javax.resource.cci.MappedRecord;
import javax.resource.cci.RecordFactory;
import javax.resource.cci.ResultSet;
import javax.resource.spi.ManagedConnectionFactory;
import com.sap.mw.jco.jra.*;
public class Example
     public void exampleTest()
          Properties properties = new Properties();
          Connection   connection=null;
          try
               properties.load(new FileInputStream ("props.txt"));
          catch(Exception e)
               System.out.println("properties could not be loaded");
               e.printStackTrace();
          try
               ManagedConnectionFactory mf = new JRA.ManagedConnectionFactoryImpl(properties);
               ConnectionFactory cf = (ConnectionFactory)mf.createConnectionFactory();
               connection = cf.getConnection();
               RecordFactory rf = cf.getRecordFactory();
               Interaction interaction = connection.createInteraction();
               MappedRecord request      = rf.createMappedRecord("STFC_STRUCTURE");
               // Since the STFC_STRUCTURE does not create any new records
               // in the data base, you do not need to start a trancation here.
               // fill out a structure with dummy data
               MappedRecord importstruct = (MappedRecord)request.get("IMPORTSTRUCT");
               importstruct.put("RFCFLOAT","1.23456");
               importstruct.put("RFCCHAR4","ABCD");
               importstruct.put("RFCINT1", "11");
               importstruct.put("RFCDATE", "2001-08-24");
               // fill out a table with dummi data
               ResultSet rfctable = (ResultSet)request.get("RFCTABLE");
               for (int i = 0; i < 10; i++)
                    rfctable.moveToInsertRow();
                    rfctable.updateString("RFCCHAR4","EFGH");
                    rfctable.updateInt("RFCINT1", i);
                    rfctable.updateString("RFCDATE", "1961-08-24");
                    rfctable.updateDouble("RFCFLOAT",1.65432);
                    rfctable.insertRow();
               // call defined RFC and cast the result to the optional ResultMap interface
               ResultMap response = (ResultMap)interaction.execute(null,request);
               // release resources
               interaction.close();
               // create an xml file from the output of the called RFC
               // the optional interface ResultMap offers additional methods, like writeXML
               FileOutputStream os = new FileOutputStream(response.getRecordName() + "_Structure_from_NotManaged_Example.xml");
               response.writeXML(new java.io.OutputStreamWriter(os,"UTF-8"),true);
               os.close();
               ResultSet resultSet = (ResultSet)response.get("RFCTABLE");
               System.out.println("Name of the table is: "+resultSet.getRecordName());
          catch (Exception ex)
               ex.printStackTrace();
               System.exit(1);
          finally
               if (connection != null)
                    try
                         connection.close();
                    catch(Exception exception1)
     public static void main(String[] args)
          Example anExample = new Example();
          try
               anExample.exampleTest();
          catch(Throwable t)
               t.printStackTrace();
the property file looks like this:
jco.client.client=010
jco.client.user=user
jco.client.passwd=pass
jco.client.ashost=your host
jco.client.sysnr=00
but this only an example for a standalone test client
to use jra inside j2ee first deploy the connector with the settings you need and then get a connection to it using jndi
i don´t have an example at hand for using it inside an ejb or servlet, but if you need one i'll have a look

What is the diffrence between BAPI and RFC and business object

Hi Experts,
Can anybody tel me what is the diffrence between RFC and BAPI , and also what is ther relation with business object?
Thanx in advance.
Nilesh Hiwale

Hi,
BAPI's are associated with Business Objects and also they are RFC enabled.
But RFC's are the FM's which can be called from external systems, those FM's can be used in many places based on the applications..
Check these Links
whats the difference between BAPI and RFC??
Diff. Between BAPI and RFC
Regards
Kiran

What is the difference between the normal function module and bapi function

hi,
what is the difference between the normal function module and bapi function module.

Hi
BAPI stands for Business API(Application Program Interface).
A BAPI is remotely enabled function module ie it can be invoked from remote programs like standalone JAVA programs, web interface etc..
You can make your function module remotely enabled in attributes of Function module but
A BAPI are standard SAP function modules provided by SAP for remote access. Also they are part of Businees Objest Repository(BOR).
BAPI are RFC enabled function modules. the difference between RFc and BAPI are business objects. You create business objects and those are then registered in your BOR (Business Object Repository) which can be accessed outside the SAP system by using some other applications (Non-SAP) such as VB or JAVA. in this case u only specify the business object and its method from external system in BAPI there is no direct system call. while RFC are direct system call Some BAPIs provide basic functions and can be used for most SAP business object types. These BAPIs should be implemented the same for all business object types. Standardized BAPIs are easier to use and prevent users having to deal with a number of different BAPIs. Whenever possible, a standardized BAPI must be used in preference to an individual BAPI.
Regards
Anji

Bapi doubt ...difference rfc and bapi

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