Field & is not initial

What causes this issue?

The field &V1& is suppressed in accordance with the G/L account field
selection &v3& in company code &v2& and with the field selection for
the posting key &v4&.

System Response

Field maintenance is not permitted via the interface.

How to fix this error?

The G/L account field selection &v3& or posting key field selection
&v4& might be incorrect.
Otherwise, you have to ensure in the application, that the field &v1&
in the interface is not filled. If this is the case, contact the
consultant responsible for this application or SAP directly.

Error message extract from SAP system. Copyright SAP SE.