How is TKOMK filled when entering function module RV_INVOICE_DOCUMENT_ADD

Hello,
I am debugging the Invoice program, SAPMV60A, and the table I am interested in is TKOMK. When I am in MV60AF0B_BELEG_SICHERN TKOMK is empty but when I enter function module RV_INVOICE_DOCUMENT_ADD TKOMK is already filled, and I can't see how.
Can anyone tell me where the information comes from?

Hi
FM RV_INVOICE_DOCUMENT_ADD belongs to function group V60A, both programs SAPMV60A and SAPLV60A have an internal table called TKOMK, so I think another fm of V60A fills the table TKOMK and so you can see it as soon you enter in a fm of V60A.
Max

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