What is the correct Account Rule source for the primary item on a Maintenance work order?

Summary:
We would like to base the account rule for a Maintenance Material Issue on the primary item of the maintenance work order. I have this working based on the item issued however, I need it to look at the primary item of the work order instead. I found the source "Work Order Primary Output Item Identifier" however, this isn't working. I'm wondering if the terminology is different for maintenance work orders from regular work orders. 2 questions: Is the "Work Order Primary Output Item Identifier" valid for maintenance work orders or just regular work orders?