That will depend on whether the goods are still in stock or not. You will start with Purchase Order Returns.. Here are your options:
Return transaction document types
You can process purchasing returns using the following return transaction document types:
•Return
•Return w/Credit
•Inventory
•Inventory w/Credit
You must use the document types Return or Return w/Credit to return non-inventoried items or any items with the item types of Misc Charges, Flat Fee, or Services. Returns against kit items are not allowed.
Each of the return document types is described in detail as follows.
Return
Select Return for shipment receipts or shipment/invoice receipts when the item is not matched to an invoice and vendor credit is not applicable. An example would be when the item is being replaced.
Manual adjustments may be necessary for return documents using the Return document type, refer to Processing manual adjustments for returns when closing purchase order lines for more information.
Return w/Credit
Select Return w/Credit for shipment receipts that are matched with an invoice, or shipment/invoice receipts when vendor credit is applicable.
To return all of the items on a partially invoiced receipt, you must complete two return transactions: one for the invoiced items using document type Return w/Credit and another for the uninvoiced items using document type Return.
Inventory
Select Inventory for inventory adjustment receipts, variance receipts, transfer receipts and sales return receipts when the item is not matched to an invoice and vendor credit is not applicable. An example would be when the item is being replaced. If you are using Project Accounting, you can’t enter this return document type for project return-from-inventory transactions.
When you process an Inventory return, if the items being returned will be replaced by the vendor, you must make adjusting journal entries to remove the accrual created by the new shipment receipt.
Inventory w/Credit
Select Inventory w/Credit for inventory adjustment receipts, variance receipts, transfer receipts and sales return receipts when vendor credit is applicable.If you are using Project Accounting, you can’t enter this return document type for project return-from-inventory transactions.
When you process a Return w/Credit return document or Inventory w/Credit return document type, a return transaction is created in Payables Management. The return transaction must be manually applied to the invoice from the vendor. See the Payables Management documentation for more information.
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