Hi
No, usually I set a break point in the VOFM and with a debugging session I check it after it is triggered. After, I try to check how to populate table LIKP until SAP get the number ID (usually with function module NUMBER_GET_NEXT). The trouble is populate this fiels (ZUKRL, ZUKRI) and check it works.
Other idea is look for notes for program error or special development for string 'ZUKRL', with its help you can research useful reports for your purpose. You can find also other templates for VOFM or the notes where some standard VOFM were created.
I hope this helps you
Regards
Eduardo