Issue with End routine to update Masterdata 0cust_sales

Urgent: Hello Gurus, We have a requirement to update 0cust_sales master data with latest buying group. Buying group is determined based on submission numbers and some other conditions. We have implemented an end routine and enabled semantic keys in DTP. The issue is End routine is not updating buying group correctly for few customers, but when I debug I can see the correct results in result_package but its not updating the P table. when I run the full dtp with a single customer in filter it works well, I am not sure why its not getting updated to P-table.
Can anyone help me. Please find the attached code.