Thanks Maheswaran!!!
Yesterday I reviewed dozens of notes and seems I missed 1317551, this is SAP answer for my issue. Second one - 1278517 - and many others I read yesterday.
Yesterday I found one 334477 (from 2001) which also confirmed my point of view.
What for I need these entries - just to process my current processes. Problem is that someone how developed this piece of code forgot to check whether functionality is activated and then call function. In my case I just need these entries to go through that function (without error). Afterwards there is a check of flag in requisition, but it's always empty as I don't use it. Anyway logic in SAP is something confusing and hard to explain it.
You make my day – thank you for that.. I can close thread unless you have something to add?
Regards
Bartlomiej