(This is a bit technical, but I would appreciate assistance for this issue.)

Client using PO module.

A user created a PO with a Sundry Vendor and received all the Items against an Invoice.
(The client would normally have first created the vendor as a regular AP Vendor, before entering the PO, but this did not happen.)
Day-End in PO was performed.

My questions are now how to handle this properly.
The client now wants to set up the Sundry Vendor as a real AP Vendor, & then enter the Invoice in AP for payment.

We do not see the Invoice in AP anywhere, since the transaction was made to a Sundry vendor.
(My guess is that nothing further is going to happen in Adagio based on the original PO entry to this Sundry vendor.)

And in GL, an entry was made by the PO: DR Inventory, CR Payables.

So, how do we make this work so that we do not have double accounting in the Ledger?

Do we just create the Invoice in AP, expensing the proper GL accounts?
And as well, make a separate Ledger adjusting entry to back out the entry made by PO?
Or is there something else that might be suggested?