Why Do Multiple WO Operations Display in the PR Page

When adding a non-stocked item to a Work Order Material Requirement, a PR is automatically generated. So what we do is update the PR with the correct description, justification, and sometimes, the charge account. To be able to update the charge account, we have to change the Destination Type first from "Maintenance" to "Expense". Once it's updated to Expense, the Work Order number and Operation Reference fields are emptied out. Then we now proceed with the update. After updating, we set the Destination Type back to Maintenance, add the Work Order number, and the Operation Reference. However, when in the