SAP Message WMOD006 - Characteristic &1 does not have category 'CHAR' (character string)

Diagnosis You selected a characteristic whose values are numeric (figures withwhich calculations are to be made). This type of characteristic is notsupported in this context. System Response INCLUDE ISR_VERARBEITUNG OBJECT DOKU ID TX Procedure Select a characteristic whose values are of the type "CHAR" (characterstring). You can enter numbers as values for this type ofcharacteristic (e.g. sizes such as 6, 8, 10), if you do not want tocarry out any calculations with these figures.