Probelm regarding function ( can not perform dml openration inside a query

Question

hi all,
i have created on function which is used for delete rows and insert new rows ( records) but when i run i got
ora-14551 -can not perform a DML operation inside a query
0ra-06512 - fn_brok_upfdate_dtltbl , line no 21
this error
following are my code please help me
CREATE OR REPLACE FUNCTION Fn_Brok_Update_Dtltbl
(fnBROK_TYPE VARCHAR2,fnSLAB_ID VARCHAR2, fnINV_TYPE_CODE VARCHAR2)
RETURN NUMBER
AS
fnCOUNT      PLS_INTEGER;
fnTBLNAME     VARCHAR2(40);
fnTMPINV_TYPE_CODE VARCHAR2(1000);
fnTMPINVCODE       VARCHAR2(50);
fnMYQUERY          VARCHAR2(4000);
BEGIN
      IF UPPER(fnBROK_TYPE) = 'UPFRONT' THEN
      fnTBLNAME :='UPFRONT_RECD_DTL';
      END IF ;
    IF fnSLAB_ID IS NOT NULL AND fnINV_TYPE_CODE IS NOT NULL THEN
    fnTMPINV_TYPE_CODE := fnINV_TYPE_CODE ;
             fnMYQUERY := 'SELECT COUNT(*) FROM '||fnTBLNAME||' WHERE SLAB_ID = '''||fnSLAB_ID||'''' ;
             EXECUTE IMMEDIATE fnMYQUERY INTO fnCOUNT  ;
          IF fnCOUNT > 0 THEN
                DELETE FROM UPFRONT_RECD_DTL WHERE slab_id = fnslab_id ;
          END IF ;
          WHILE fnTMPINV_TYPE_CODE IS NOT NULL
                LOOP
                    SELECT  CASE WHEN INSTR(fnTMPINV_TYPE_CODE,',')= 0 THEN fnTMPINV_TYPE_CODE
                    ELSE Strsplit(fnTMPINV_TYPE_CODE,1,INSTR(fnTMPINV_TYPE_CODE,',') - 1  ) END  INTO fnTMPINVCODE FROM DUAL ;
                    fnMYQUERY := 'INSERT INTO '||fnTBLNAME||'(SLAB_ID, INV_TYPE_CODE)
                            VALUES ('''||fnSLAB_ID||''','||fnTMPINVCODE||') ' ;
                    EXECUTE IMMEDIATE fnMYQUERY ;
                    SELECT CASE WHEN INSTR(fnTMPINV_TYPE_CODE,',')= 0 THEN NULL
                    ELSE Strsplit(fnTMPINV_TYPE_CODE,INSTR(fnTMPINV_TYPE_CODE,',')+ 1 , LENGTH(fnTMPINV_TYPE_CODE)) END
                    INTO fnTMPINV_TYPE_CODE FROM DUAL ;
               END LOOP ;
   fnCOUNT := 1 ;
   RETURN fnCOUNT ;
   END IF ;
END ;
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Answer 1

How did you call this function ? from SQL Statement ? Then No way .. . .
ORA-14551: cannot perform a DML operation inside a query
Cause: DML operation like insert, update, delete or select-for-update cannot be performed inside a query or under a PDML slave.
Action: Ensure that the offending DML operation is not performed or use an autonomous transaction to perform the DML operation within the query or PDML slave