ECM tables for change documents

Dear all,

As known once when ECM is used to do the changes in BOMs. The ECM will record what all changes done in the Environment - reporting - bill of material.

I want to know exact tables and fields where this record will be done by ECM. I need to use this data for some client based development. I checked in many of ECM related tables but I was not able to find the same.

Can anyone please help me on this as its critical.

regards,

sai