"DAL Exception occured" while using SAP B1

I am using SAP B1 with HANA backend. I am trying to execute the below query 


SELECT T0."Code" || '-' || cast(current_date as varchar) || '/' || cast (current_time as varchar) AS "BXBATNUM" FROM OPOR T0 WHERE T0."DocEntry" = [%4]


I got the error as


DAL Exception occured ---> System.Data.Odbc.OdbcException: ERROR [S1000] [SAP AG][LIBODBCHDB32 DLL][HDBODBC32] General error;260 invalid column name: current_date: line 1 col 39 (at pos 38)


the query seems technically correct to me, but not sure what the concern is