How to create a Web Service in ABAP 4.7E

Question

Dear Experts,
        We are on SAP R/3 4.7E. Can anybody tell me what are the Pre-requisites or steps to exposed an existing BAPI / RFC's as Web Services. Kindly explain me in detailed. or if any link is available.
Regards,
Umesh

Answer 1

Hi Umesh,,
Follow these Steps:---  They may help you...
+Configuring Web Service Security in AS-ABAP
Use
To configure Web service security in SAP NetWeaver usage type AS-ABAP, you have to do the following:
· Configure the RFC destination for the Web service security services
· Configure the logical port for the Web service security services
Configuring the RFC Destination
Perform the following steps to configure the RFC destination for the Web service security services:
1. Use transaction SM59 to create a new RFC destination of type HTTP Connections to Ext. Server.
2. Specify connection type G and enter an arbitrary description.
3. Specify the following technical settings:
¡ Target Host: Host name of the Integration Server (AS-Java)
¡ Service No.: Port number of the Integration Server (AS-Java)
¡ Path Prefix: Path prefix of the Integration Server (AS-Java)
Depending on the logon procedure or security settings you are going to specify in Step 4, you must set the path prefix as follows:
§ If the logon procedure is Basic Authentication and the SSL option is inactive, enter the path prefix /wssproc/plain?style=document.
§ If the logon procedure is Basic Authentication or Send SAP logon ticket, and the SSL option is active, enter the path prefix /wssproc/ssl?style=document.
§ If the logon procedure is SSL Client Certificate or Send SAP logon ticket, and the SSL option is active, enter the path prefix /wssproc/cert?style=document.
4. Select the logon/security settings that correspond to the path prefix specified in Step3..
Configuring the Logical Port
Perform the following steps to configure the logical port for the Web service security services:
1. Use transaction LPCONFIG to configure the logical port by specifying the following attributes.
Settings for the Logical Port:
Attribute
Value
Proxy class
CO_WSSEWSSPROCESSOR_VI_DOCUMEN
Logical port
BASIC
Description
Any description
Default port
Select the check box
Runtime
Select Web Service Infrastructure
Call parameter: HTTP Destination
Enter the RFC destination you configured above
2. Save and activate the logical port.+
+Wizard-Based Basic Configuration
After full installation and before manual configuration, you can run the wizard-based basic configuration for SAP NetWeaver usage type PI. The configuration wizard saves you time and manual steps.
Only carry out the wizard-based configuration if your system has never been configured before. If you have modified the system already or if you have upgraded from an older release, do not use the configuration wizard. Instead, use the manual steps as required.
To carry out the wizard-based configuration steps required for your PI system, perform the following steps:
1. Call the wizard-based configuration tool as described in Configuration Wizard.
2. Select the scenario PI and the task PIPostInstallProcess.
3. Choose Execute.
A list of the steps to be executed by the wizard is displayed.
4. Choose Install.
The steps are executed one after the other (some steps may take some time).
The wizard-based configuration for usage type PI performs the following post-installation steps:
● Checking sap.com services
● Performing automatic customizing
● Assigning application roles to user groups
● Maintaining a product for the technical system
● Maintaining a business system for the Integration Server
● Creating RFC destinations in the ABAP environment
● Creating RFC destinations in the ABAP and Java environments
● Creating the HTTP destination pmistore
● Configuring the role of the Integration Server
● Registering queues used by the Integration Server
● Triggering the Self-Registration of the Adapter Engine
If you do not want to use the configuration wizard to perform the basic configuration steps required for usage type PI, you have to carry out these steps manually as outlined in the step descriptions you access by following the hyperlinks above.
Afterwards, perform the following checks:
Ensure that
See
You have installed the XI add-on in each involved business system that is based on SAP Web Application Server (AS) 6.20.
Use SAP Web AS 6.20 kernel patch level 1253 if you want to generate new ABAP proxies in your business systems based on SAP Web AS 6.20.
SAP Note 439915; if you generate ABAP proxies, see SAP Notes 675441 and 721160.
You have imported the content of software component SAP_BASIS into the Integration Repository (interfaces, mappings, and so on).
For more information, see Importing Process Integration Content.
The connection between the Integration Server and the SLD has been established by calling transaction SLDCHECK.
The system displays a log that lists the current configuration data, the function test results, errors, and notes for checking.
Installation Guide SAP NetWeaver 2004s on SAP Service Marketplace at service.sap.com/installNW2004s.
SAP System Landscape Directory
System Landscape Directory in SAP Exchange Infrastructure.
If you want to use a central SLD, further manual steps are required. For more information, see SAP Note 939592.
If you want to use an Integration Server client other than 001, further manual steps are required. For more information, see SAP Note 940309.
+
+Optional Additional Configuration Steps
The following additional configuration steps are optional:
· Configuring the Change Management Service (CMS)
· Configuring message archiving for the Adapter Engine
· Configuring the Integration Builder documentation editor
+
And then you may goto Link->:http://help.sap.com/saphelp_nw04s/helpdata/en/b8/cb1141e109ef6fe10000000a1550b0/frameset.htm
This will give you complete description ...
"Plz Dnt forget to reward points"</b></u> 
Regards,
Mandeep.