I have now changed settings back to the original screenshot, the error is no longer triggering. So yes, now the only issue is why is 261000 being triggered when I MIGO a PO with blank acct assn cat rather than the GL assigned to both the valuation class for material and BSX transaction.
I deleted the GL in PRD from OBYC, but the system requires me to maintain PRD in order to MIGO even when there is no price difference.