Error
QuickBooks Online payment [link] has applied credit with multiple invoices. Only one invoice can be present per QuickBooks Online payment when applying credit.
Cause 1
Resolution
You can apply a credit memo to multiple invoices by splitting it across multiple payment records. A payment record without a credit memo on it can be applied to multiple invoices. You will need to remove the credit memo applied and apply it to each invoice in a separate transaction.
Example
Credit memo 100 is for $100. Invoice 101 and Invoice 1022 are both for $50. You will need to apply credit memo 100 to invoice 101, save, and close. Then apply credit memo 100 to invoice 1022, save, and close.
Note: If Credit memo 100 is applied to invoice 1 and 2 in the same transaction, it will fail.
Cause 2
Resolution
You can apply multiple credit memo to a single invoice by splitting it across multiple payment records. A payment record without a credit memo on it can be applied to multiple invoices. You will need to remove the credit memo applied and apply it to each invoice in a separate transaction.
Example
Credit memo 100 is for $100 and credit memo 101 is for $100. Invoice 102 is $200. You will need to apply credit memo 100 to invoice 102, save, and close. Then apply credit memo 101 to invoice 102, save, and close.
Note: If Credit memo 100 and 101 is applied to invoice 102 in the same transaction, it will fail.