Inventory Received Not Billed - bills are not received

I am wondering how other people handle these situations. When analyzing the inventory received not billed account, I found 2 scenarios:

1.) A standalone bill was created instead of billing from the PO. Items were received on the PO so there is a balance in Inventory Received Not Billed.

2.) We received more than was billed for an item and the PO was adjusted to allow us to receive them, but were never billed for them. So the additional items were received against the PO and created a balance in the Inventory Received Not Billed account.

These were all done in closed periods so I thought the best solution was to "Bill" the remaining items on the PO at $0, post the variance, and then post a JE to reduce the variance to the COGS account that was initially increased for the standalone bill. However when I do this and try to create the saved searches in SuiteAnswers