Explain the situation for using ale , bapi ,session ,call transation, di

what is the use of bdcmsgcall,
if any erroe occur in the legacy records how to rectify it?
In what situation we can go for lsmw.
Kindly explain the situation's for using ale , bapi ,session ,call transation, direct input.

Hi ashok,
chk this.
the functionality of both idoc and bapi are same.
the main difference in BAPI is it is used for Third party application like JAVA, VB etc.
and IDOC is used transfer data from the SAP to sap or non-sap system.
For details refer the contents below
ALE
ALE is SAP proprietary technology that enables data communications between two or more SAP R/3 systems and/or R/3 and external systems. When a new enterprise resource planning (ERP) solution such as R/3 is implemented, companies have to interface the ERP system with legacy systems or other ERP systems.
ALE provides intelligent mechanisms where by clients can achieve integration as well as distribution of applications and data.
ALE technology facilitates rapid application prototyping and application interface development, thus reducing implementation time.
The ALE components are inherently integrated with SAP applications and are robust, leading to a highly reliable system.
ALE comes with application distribution/integration scenarios as well as a set of tools, programs, data definitions, and methodologies that you can easily configure to get an interface up and running.
BAPI
BAPIs provide a stable, standardized method for third-party applications and components to integrate into the Business Framework. These interfaces are being specified as part of SAP's initiative with customers, partners and leading standards organizations. Also, SAP has implemented the emerging Object Application Group (OAG) specifications with BAPIs.
Session method.
1) synchronous processing.
2) can tranfer large amount of data.
3) processing is slower.
4) error log is created
5) data is not updated until session is processed.
Call transaction.
1) asynchronous processing
2) can transfer small amount of data
3) processing is faster.
4) errors need to be handled explicitly
5) data is updated automatically
Session method is to populate the data by filling BDC structure
and keep as session to process from SM37 to post in appropriate Transaction.
Call transaction method is to post the data directly into the Transaction from an Executable program.
Session method SAP defined Function modules.
U can see more help on the differences in the SAP help.
hope u got an idea.
rgds
anver
<i>if hlped pls mark points</i>

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Explain the situation for using ale , bapi ,session ,call transation, di

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