Retention amount &1 &2 is greater than gross amount &3 &4

What causes this issue?

The retention amount is higher than the gross amount of the document.

System Response

The system cannot post the document.

How to fix this error?

Enter a lower amount for retention.

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.