If you've created a supplier return which needs changing, here's how to do it.
To edit a supplier return
From the Purchases menu, click Supplier returns.
Locate the return to be edited.
From the Supplier list, choose the supplier whose returns you want to see.
In the Search field, enter all or part of a supplier's name or the return amount. As you type, matching returns are shown.
Click a column heading to sort the displayed list by that column.
Click the Bill number for the return you want to edit.
Make your changes to the return.
When you're done, click Save.