Total exceeded by &1 &2

What causes this issue?

You have enterd an amount in the payment plan which exceeds the amount
specified from the commitment budget.

System Response

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

How to fix this error?

Change either the amount in the payment plan for the document or the
amount in the commitment budget.

Error message extract from SAP system. Copyright SAP SE.