How can I change the details of a Purchase Invoice back to the old supplier details whilst still using the current supplier details on the future timesheets?

I am trying to change the details of a Purchase Invoice back to the old supplier details. I only want this invoice to have the old supplier details and carry on using the current supplier details on the future timesheets.

You will need to void this invoice by going to 'Invoice/Remittance Edit' (keep a note of timesheet ref number).

Then go into the assignment and change the supplier. Once you have done this you can go to 'Create Purchase Invoices' under Supplier Payments and the timesheet will be waiting there to be invoiced with its new supplier details.

Once you have finished make sure you change the assignment back to the current supplier details