Requirement- A different WO variance account if one of the operation is OSP

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We have OSP as one of the operation in both rework and non std wo.

For such WOs where OSP is one of the operation, we want to have a different Job Close Variance Account.

We are not able to find anything in account rule or mapping set to map this.

We need to keep in mind the item which shows for Job Close transaction is Final Assembly, not the OSP item.

We use rework and non std work orders for non OSP processes. So, we can't use WO type to drive the variance account.