MB1C transaction - material doc posted sucessful but MSEG table not updated

Hi Experts,

Standard transaction MB1C to post material documents... posted the document successfully and i get the message "Document 4900001978 posted" but when I go and check the table MSEG.. the entry is not found.

Any ideas why is that not updated in table MSEG?

In the program SAPMM07, which module updates the table MSEG?

All ideas are welcome and highly appreciated.