unknown account assignment

2505497 - Error SE179 is issued when create SES

Error SE179 "Account assignment category 'U' not defined here" is issued when creating Service Entry Sheet even the entered account assignment category is not 'U'.

Environment

Materials Management (MM)
SAP R/3 Enterprise 4.7
SAP ERP Central Component
SAP enhancement package for SAP ERP
SAP enhancement package for SAP ERP, version for SAP HANA
SAP S/4HANA

ECC, V_T163K-KZVBR, SE 179, Consumption posting, ML81, BAPI_ENTRYSHEET_CREATE , KBA , ml81n , unknown , MM-SRV-SR , Service Entry , MM-SRV-ACC , Account Assignment , Problem