When we issue the goods to (Cost Center, Process Order/production order/Product cost collector, Asset etc) by transaction MIGO, system update the business transaction RMWA, but when we issue the goods by transaction MFBF ( GI/GR) to product cost collector, system update the business transaction RFBU.
Actually we defined a derivation strategy for business transaction RMWA (goods Issuance) to make the stock line item statistical.
My question is why not system updates the business transaction RMWA for goods issuance to PCC with other transaction. Transaction is different but process is same.
I would propose to change your derivation strategy for inventory and base it on debit/credit field with the combination of movement type and account. SAP has several dozens of business transactions and they are used according to the hard-coded logic; take it or leave it