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Grouping of Credit Memos 
You can use this process if you want to simplify the posting of credit memos to your customers/claimants.
In the course of warranty claim processing, one or more credit memos are created for the claimant per warranty claim and then posted to accounting.It does not make sense to send each individual credit memo to the customer/claimant separately; it would seem more sensible to collect the credit memos together and send them all at once at a later date in the form of a credit memo list.

This function is only offered for postings to customer accounts (credit memos to the customer/claimant) and not for postings to vendor accounts (debit memos to the vendor/reimburser).
· You have posted credit memos to the customer/claimant in the course of warranty claim processing.
· You have maintained the field InvoicingListDates in the sales view of the customer master record for this customer/claimant.
...
1. Over a specific period of time, you post the credit memos that are created per warranty claim directly to accounting (FI and CO). This has a direct effect on the costs and revenue. However, the customer/claimant is unaware of this.
2. At the end of this period, you create a credit memo list for each customer/claimant (transaction WTYCL). All the credit memo amounts for the appropriate customer and period are contained as individual items in this list. The list is a new document with its own reference document number (WL + smallest warranty claim number + version number). This number is inserted in all credit memos when the list is posted.
3. You transfer the credit memo list to the customer/claimant.
4. The open items are automatically cleared using the reference document number (transaction FB05).

You can cancel a credit memo at any time via the warranty claim version, even if the credit memo has already been transferred to the customer/claimant in a credit memo list. The new cancellation document is then included in the next credit memo list that is to be created.
