Open the 
Sales Credit Memo
window.
Press F3 to create a new credit memo.
Fill in the No. field.
In the Sell-to Customer No. field, enter the number of the customer in the service contract. You can also choose to use the Copy Document batch job.
You can use a contract sales credit memo when a customer cancels a prepaid service contract or removes a service item (a contract line) from a prepaid contract. You can also use it to correct an erroneous contract sales invoice.
Open the Sales Credit Memo
window.
Press F3 to create a new credit memo.
Fill in the No. field.
In the Sell-to Customer No. field, enter the number of the customer in the service contract. You can also choose to use the Copy Document batch job.
On the Invoicing tab, you can see the other information that the program copied from the customer card. If you want to post the credit memo to a different customer than the one specified on the General tab, enter the number of that customer in the Bill-to Customer No. field.
You can compare the credit memo to the original posted document, for instance in the Posted Sales Invoices window.
In the Posting Date and Document Date fields, enter a date.
On the credit memo lines, enter information about the items that have been returned or removed, or the sales allowance that will be sent. You can also choose to use the Get Contract Prepaid Entries batch job.
You can apply the credit memo line to a specific item ledger entry, job entry or service entry, and you can assign item charges to it.
If you remove contract lines from a service contract that has been invoiced, the program can automatically create a credit memo. If the Automatic Credit Memos field on the Invoice Details tab in the Service Contract window contains a check mark, the program automatically creates a credit memo when you remove the contract lines. If the field does not contain a check mark, the program automatically creates a credit memo when you click Functions, Create Credit Memo in the Service Contract window.