Subitem &1 (category &2) must not be entered or posted

What causes this issue?

The system determined subitem &V1& for subitem category &v2&. However,
the data entry indicator has not been selected for this subitem.

System Response

The system cannot post data records to this subitem.

How to fix this error?

Select the data entry indicator in the master record of item &V1&.

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.