Issue with Dynamic SQL

Question

I am using a dynamic SQL which generates a insert SQL at runtime.
     DBMS_OUTPUT.PUT_LINE('CREATE_BACKUP');
     L_DYNAMIC_SQL_SEL := ' ( SELECT ';
     L_INDEX := 0 ;
     FOR COLUMN IN TAB_COLUMNS(P_TABLE_NAME) LOOP
          L_COLUMN_NAME := COLUMN.COLUMN_NAME ;
          IF( L_INDEX > 0 ) THEN
               L_COLUMN_NAME := ','||L_COLUMN_NAME;
          END IF;
          L_DYNAMIC_SQL_SEL := L_DYNAMIC_SQL_SEL || L_COLUMN_NAME;
          L_INDEX := L_INDEX + 1 ;
     END LOOP;
     L_DYNAMIC_SQL_SEL := L_DYNAMIC_SQL_SEL || ' ,CAST(' ||P_CSM_ID ||' AS NUMBER(32)) AS CUST_SET_ID';
     L_DYNAMIC_SQL_SEL := 'INSERT INTO '||P_BK_TABLE_NAME||L_DYNAMIC_SQL_SEL||' FROM '||P_TABLE_NAME ||' ) ;';
     EXECUTE IMMEDIATE L_DYNAMIC_SQL_SEL;
The generated insert SQL looks like
INSERT INTO XX_YY_OPTIONS_B_BK ( SELECT MODULE_ID,APPLICATION_ID,PROFILE_OPTION_ID,PROFILE_OPTION_NAME,HIERARCHY_NAME,USER_ENABLED_FLAG,USER_UPDATEABLE_FLAG,SQL_VALIDATION,START_DATE_ACTIVE,END_DATE_ACTIVE,CREATION_DATE,CREATED_BY,LAST_UPDATE_DATE,LAST_UPDATED_BY,LAST_UPDATE_LOGIN,ENTERPRISE_ID ,CAST('1' AS NUMBER(32)) AS CUST_SET_ID FROM FND_PROFILE_OPTIONS_B ) ;
When calling EXECUTE IMMEDIATE L_DYNAMIC_SQL_SEL; it throws an exception "ORA-00911: invalid character" .At the same time If I execute the above query through SQL Plus, it inserts the data.
What could be the issue here? .Any pointers would be helpful.
Thanks

Answer 1

Refer to http://docs.oracle.com/cd/B19306_01/appdev.102/b14261/executeimmediate_statement.htm
Especially the first paragragh under 'Usage notes'.
Sybrand Bakker
Senior Oracle DBA