SAP Message V1022 - Item category & is not defined for non-material items

Diagnosis
This item category is not allowed, as an item without a material isdealt with as a text item by the system. The item category &V1& ishowever not used for text items.
INCLUDE 'NA_NO_PROCESSING_1' OBJECT DOKU ID TX LANGUAGE E
INCLUDE 'NA_CHECK_ENTRY' OBJECT DOKU ID TX LANGUAGE E
DEFINE &FELDNAME& = 'Item category'
INCLUDE 'NA_POSSIBLE_ENTRY' OBJECT DOKU ID TX LANGUAGE EEnter a material number if you do not want to use the item as a textitem.