Hi
Refer to methods in Class CL_UKM_EVENT_MANAGER. Try to put the breakpoints in these methods to see the program flow
HANDLE_CHECK_RULE_CHANGED
HANDLE_CREDIT_CHECK_FAILED
HANDLE_CREDIT_LIMIT_CHANGED
HANDLE_CREDIT_LIMIT_INVALID
There is a standard event CHECK_RULE_CHANGED
If you cant find the correct standard event, then you have locate the BTE/UserExit/Enhancement spot in standard code to pro grammatically trigger the custom event for Class CL_UKM_BUSINESS_PARTNER . You will have create custom workflows for these events.
Regards
Sandy