TCODE and TABLE relationship

I am experimenting with BDC.
I am inserting data for TCODE: MM01
I want to find out which tables my BDC inserts data into for TCODE MM01.

In other words, which all tables SAP inserts data into for TCODE MM01.

Here is how i am checking for this:
I check table tstc, and find out that TCODE: MM01 uses program SAPMMG01.
However SAPMMG01 enters data into table RMMG1, not MARA as expected.
Here are the screenshots.

tstc table entry
procedures called by program SAPMMG01
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gram77Author Commented:
One way is to run the TCODE: MM01 and trace the session at the other end.

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