SAP Message UCFE887 - The value for &1 differs from the specified fixed value

Diagnosis
The value for &V1& is fixed in the breakdown category
of item &V2&. A value for &V1& is also specified in the header ofthe data entry layout, but it differs from the fixed value in thebreakdown category.

System Response
It is not possible to insert a new row.

Procedure
Change the value for &V1& in the header of the data entry layout, orchoose a different item.