Tracking Production BOM changes in Documents
I am a BW consultant and am working on a report that concerns tracking changes to the BOM code in documents. The situation is
The PP BOM is created and basis that procurement and GR is done. However changes to the PP BOM are frequent and cause problems while MIGO. For example on a certain day a material, lets say A, requires 2 qty of material A2 and on another it requires 1 qty of A2. This causes discrepencies in the inventory. So a report that can give a comparison of the actual qty ( as given by the GR doc) and the ideal qty ( as given by the BOM) can help check this.
To the best of my understanding tracking BOM changes on doc level solve the purpose so that one can spot the state of the BOM on the doc level. Is this possible in std R3 system ? If yes, then what are the entities involved ?
Am aware of a functionality called ECM, Engineering Change Management, but am not sure if that will help here.
Thanks in advance.