Calculated time period up to specified value date is &1 days

What causes this issue?

The number of work days between the posting date (execution date) and
required value date entered with the house bank under use of the valid
factory calendar amounts to &v1&.

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?

Error message extract from SAP system. Copyright SAP SE.