Accounting for OPM

Hi

My question is this. For OPM set up, is it mandatory to specify the accounts to be used on the Batch Close Variances, Batch Completion and Batch Release event type on the SLA? If yes, what will be the qualifiers? I have already customized for Inventory Valuation account.

Also, if we were implementing the Discrete Manufacturing, where would these accounts be picked up? On Master Item or Organization Parameters or other set up?

Thanks in advance

Rgds

Zaynah