Update Purchase Invoice numbers for submitted Invoice

This is regarding submitted Purchase Invoice where-in to reflect the amount to be paid in the Accounts Payable we must submit the purchase invoice. However, in our case, we cannot get the official reciept/invoice if we have not yet paid the amount. We are only provided by the supplier the Delivery/Trust Receipt.
Althought, I can add a field at the payment entry for the Invoice number. Will it be possible to have the supplier invoice number and date be editable while the status is unpaid?

You can make and save any changes you like until it is submitted. Maybe leave the items as “saved” and only submit them once all the steps needed are complete?

yes, it can be done as that. However the amount will not reflect on the “Accounts Payable” report.