How I have to do to write data into dbf in particular cell?

Hello,

I use the cicode below to write data into dbf files. 

PRIVATE INT FUNCTION DataFromAPPToDB(STRING sRicetta);
INT hDev,hRec;
STRING s;

hDev = DevOpen("Ric_riv",0);
hRec = DevFind(hDev,sRicetta,"RICETTA");
IF hRec <> 0
THEN
Message("Error","@(Ricetta non trovata)",0);
RETURN -1;
END

//Inizio Variabili
DevSetField(hdev,"RICETTA",_nome_ric_ricetta );
DevSetField(hdev,"TIPO1",_SCRITTA_SACCO );

DevSetField(hdev,"ING1",IMP_14F_ART );
DevSetField(hdev,"CODICE1",IMP_14F_DES );
DevSetField(hdev,"PERC1",_Perc_ric_14F);

DevSetField(hdev,"ING2",IMP_15F_ART );
DevSetField(hdev,"CODICE2",IMP_15F_DES );
DevSetField(hdev,"PERC2",_Perc_ric_15F);


DevClose(hDev);
Prompt("@(Ricetta salvata)");
RETURN 0;
END

The dbf is configured with the first line like :

RICETTA,C,50 ING1,C,50 ING2,C,50 PERC1,C,6 PERC2,C,6 CODICE1,C,20 CODICE2,C,20 TIPO1,C,20

In this case, all data will be written in the column below the specified cell.

Question:

How I have to do to write one value to a cell B4  or C15?