Purchase Price Variance Against Outside Operations

BPCS 4.05CD

My apologies if I've asked this before and totally forgotten, but:

We send probably half our product line out for an outside operation.  The PO
is keyed as an outside operation against the shop order and routing step.
The routing step is coded as a 'C' (outside op with cost) and a cost is
keyed onto the routing master.

The question:  When the invoice for the outside op is keyed, BPCS tries to
generate a dollar amount into the variance account, but the variance is
calculated against the item's total standard cost.  Can BPCS generate the
variance against the routing's outside op cost?

Thanks in advance.