Hi Vijay,
A few observations and sugesstions:
1. In your code there is a statement 'WHEN 'ZBW_ORDCNF_DS'.' This should be your datasource name, in your case its 'ZDS_AFRU'. So replace ZBW_ORDCNF_DS with ZDS_AFRU first.
2. Can you try to debug the datasource by putting the debug in RSA3 screen top - Execution Mode as Debug Mode? With this you will reach to the point where your FM will be called and you can then debug the first statement.
3. As you created your datasource in RSO2 - can you send the Generic delta field screenshot? I am interested in the safety limit you have set. Something like below:
4. Next, can you share your RSA7 delta queue screen for your delta after you have initialized it from BW. I am interested in Delta Relevant Field value. Something like below:
5. While testing in FULL mode in RSA3, provide some selection value and then try to debug and see what selection fields are visible in I_T_SELECT.
Please let us know above and then we can proceed further.
Thanks
Amit