How to check Data Source extraction Logic

Question

Hi Experts
Please explain me in details steps how/where can i check the logic of data sources
We have data sources based on
1) Custom data source based on Function Module  (Where can i check the code/logic....)
2) Standard Business Content Data source (Where can i check Logic)
3) Standard Business Content Data source which is enhanced to inculde ZZ fields (Where can i check Logic)

Answer 1

1) Custom data source based on Function Module (Where can i check the code/logic....)
Go to tcode RSO2, enter the generic DataSource name and click Display. In the next screen, it will show you the Function Module that that's used for the extraction of data. Copy that FM name, go to tcode SE37, past the FM name that you previously copied and then click on Display. This is where you can view the extraction logic for the generic DataSource based on a Function Module.
2) Standard Business Content Data source (Where can i check Logic)
Follow the same for display of generic DataSource source. On the initial screen, if you get an I-type message after clicking on Display, that message displays the name of the Function Module being used, otherwise hit Enter to get to the next screen.
3) Standard Business Content Data source which is enhanced to inculde ZZ fields (Where can i check Logic)
Transaction CMOD is used for the creation/maintenance of User Exits. In CMOD, use the dropdown to select the custom Project that's been defined on your source SAP application for BW extraction User Exits, and select the Components radio button. Click on Display. A list of INCLUDE programs will be shown. These INCLUDE programs each represent the four types of DataSources.
EXIT_SAPLRSAP_001 - Transaction Data DataSources User Exit
EXIT_SAPLRSAP_002 - Master Data Attribute DataSources User Exit
EXIT_SAPLRSAP_003 - Master Data Text DataSources User Exit
EXIT_SAPLRSAP_004 - Master Data Hierarchy DataSources User Exit
You will have to know the type of data (e.g. Transaction, Master Data Attribute, etc) to know which INCLUDE to go into. Once you know which one to go into, double-click on it and this will bring into display mode on that INCLUDE. Another INCLUDE will be present that begins wth Z*. Double-click on that, and you should then be in the area where the logic is for determining where to go if the DataSource has a certain value and you should be able to get to the code to read through it from there.
You can also get to these EXIT_SAPLRSAP_NNN programs via tcode SE38.