Having the overpayment already creates the credit. Your Credit Note is too much activity.
You can print a statement or print the journal view of the payment, to show them their Credit on hand.
Resolution for 'creates the credit issue: 'When over paid how do you allocate a Credit Note to the balance c/f?' available: Yes.
The creates the credit issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the creates the credit issue yourself by looking for a resolution described in the article. If it is a complex creates the credit issue or you are unable to solve the issue, you may contact us by clicking here or by using other creates the credit support options.
For more information about resolving issues related to creates the credit in Quickbooks/QBO or to get support for the issue 'When over paid how do you allocate a Credit Note to the balance c/f?', click the link below: