Correcting Sales Invoices with Credit Memos

If you have posted an erroneous invoice, you can correct it by issuing a credit memo.

To Correct Sales Invoices with Credit Memos:

Create a new credit memo.
Place a check mark in the Correction field.
Fill in the necessary lines with the items and corrective quantities. You can either fill the lines manually, or, if you want to copy information from other documents, you have two options for filling the lines automatically:

You can use the Copy Document batch job to copy an existing document to the credit memo. Use this function to copy the entire document. It can be either a posted document or a document that is not yet posted. This function only enables exact cost reversing when exact cost reversing is set up as mandatory in the sales and receivables setup.
You can use the Get Posted Document Lines to Reverse function to copy one or more posted document lines from one or more posted documents to the new credit memo document. This function always exactly reverses the costs from the posted document line, regardless of whether exact cost reversing is set up as mandatory in the sales and receivables setup.
When you use either of these functions (and, in the case of Copy Document batch job, when you have also set up exact cost reversing as mandatory in the sales and receivables setup), the program creates a link to the original item ledger entries in the Appl.-from Item Entry field to ensure that the costs are copied from the original posted document. If the line has item tracking, the program fills the Appl.-from Item Entry field on the item tracking line or lines instead of on the document line.