IDOC Status 03, but some fields are missing in SEGMENT

Dear All,

Outbound Idoc Processd successfully with status 03, basic type (INVOIC02). But in output file some fields are missing in one segment.

How to find missing fields, and how to debug this. I tried by putting break point in FM IDOC_OUTPUT_INVOIC, but debugger is not getting trigger.

Please help how to check missing fields.

Thanks,

Venky.