OBYC error at the time of cost run released

Hi,

For a material we have standard cost for previous period. For this month as we are going to release the standard cost we are getting the error.

Account determination for entry VCA UMB not possible

What i know here we mainatin revaluation account.

I just want to confirm whether system needs revaluation account in UMB or it is fine with price difference account in PRD.

Thanks

Anagha