Hi Eli,
I maintained FM derivation rule as follows.
FMDERIVE is skipped for GR/IR lines and the Commitment item is inherited from the PO regardless of whether or not the GR/IR line is FM relevant. This is SAP standard behavior.
If you want to force the Commitment item to be derived from the GL account for the GR/IR line, you can use the FLG_FMDERIVE_FORCE flag as described in note 923672. This will allow FMDERIVE to be called for these lines. Please be sure to fully test this to ensure that FM account assignments that you do not want to be overwritten are not incorrectly derived.
Commitment item not picking while MIRO posting ... | SCN
Trace only shows Inventory GL and its FM account assignments derived from derivation rule but does not show GR/IR clearing account GL and its FM account assignments in Trace. I checked it by clicking the button right button of trace to go to the next FM account assignments.
Regards,
Atif