SAP Message UCMI040 - Doc.type &1: Change the input options for document field "&2"

Diagnosis
In document type customizing on the Document Field Options tab,there are several entry options you can choose for the document fields.Note that the entry option According to Breakdown Category can bechosen only for document fields that are also subassignments.
However, in document type &V1& you have chosen According toBreakdown Category for document field '&V2&' even though it is not asubassignment.

System Response
Processing is terminated.

Procedure
In document type &V1&, do not choose According to Breakdown Category fordocument field '&V2&'.