Function module to get list from CDHDR for MATERIAL

Hello,

I am searching for the function to get a list of CDHDR-entries for a material in transaction MM03.

My debugging was not successful. So I hope someone here has the answer.

What is the name of the function that SAP uses in TA MM02/MM03 to get the list of CDHDR-entries for a material number and from where (include) is it called?

I found already the function to get the related CDPOS entries, starting from the list with CDHDR entries in the transaction.

This is CHANGEDOCUMENT_READ_POSITIONS.

But here I am definitely too late, because I am searching for the reasn why one of my changes entered in CDHDR is not selected!

Thank you in advance for the answer!

Best regards

Dirk