Wrong account picking for PRD(price difference) in MIRO

Dear folks,

I am facing an error while posting invoice in MIRO. It shows an error message Account 270300 BRPL is blocked for posting.

This G/L is created for Gain and loss phy – inv.

But we are doing invoice based on PO. There is price difference in MIGO and MIRO. We know that this price difference has to post in price difference account. System pick wrong G/L account i.e insteat of 470100 it is picking 270300.

I had checked in OBYC for PRD transaction key for the valuation class. This valuation class is assigned to G/L 470100.

please find screen shot.

Please give some suggestion.

Regards,

B V