Note: This operation is only available if you have Invoice Settlement enabled. The Invoice Settlement feature is generally available as of Zuora Billing Release 296 (March 2021). This feature includes Unapplied Payments, Credit and Debit Memo, and Invoice Item Settlement. If you want to enable Invoice Settlement, see Invoice Settlement Enablement and Checklist Guide for more information.

Unapplies an applied credit memo from one or more invoices and debit memos. The full applied amount from invoices and debit memos is transferred into the unapplied amount of the credit memo.

You can unapply a credit memo from an invoice or a debit memo only if you have the user permission. See Billing Roles for more information.

When you unapply a credit memo, the total number of credit memo items and the items that credit memo items to be unapplied from must be less than or equal to 15,000.

If the limit is hit, you can follow the following instructions:

• If you want to unapply one credit memo without specifying invoices or debit memos and the limit is hit, you have to specify the invoice items or debit memo items in the request to decrease the number of items.
• If you want to unapply one credit memo from multiple specified invoices or debit memos, decrease the number of invoices or debit memos in the request.
• If you want to unapply one credit memo from a single invoice or debit memo with a large volume of items, you have to specify invoice items or debit memo items in the request. The maximum number of invoice items or debit memo items that you can specify in the request is 1,000.
• If a credit memo has a large volume of items, you have to specify credit memo items in the request. The maximum number of credit memo items that you can specify in the request is 1,000.
• When unapplying a credit memo, the total number of the credit memo's item parts must be less than or equal to 1,000. Otherwise, the operation would fail and an error message would pop up. When you see this error, you can try using the Unapply a credit memo API as an alternative. Similarly, make sure that all the requirements listed in the API reference are met.

If the Proration application rule is used, when unapplying credit memos, the following quantity must be less than or equal to 15,000:

(number of invoice items + number of debit memo items) * number of credit memo items

Otherwise, the First In First Out rule will be used instead of the Proration rule.