No installment plan defined, manual processing necessary

What causes this issue?

Transfer posting of an installment plan has not been executed
completely. The system was able to clear the installment plan &v1& that
you wanted to transfer post, and create a new business partner item,
but the new installment plan you wanted to create could not be assigned
uniquely to an existing business partner item in transfer posting
document &v2&. The assignment should be conducted by way of matching
amounts.

System Response

No new installment plan is created.

How to fix this error?

Create an installment plan for the desired business partner item in
transfer posting document &V2&.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.