> In the command button, I have the following coding
>
>

IF !EMPTY(ThisForm.txtRecDate.Value) AND !EMPTY(ThisForm.txtVendorinvoicenumber.Value) AND thisform.checkduedate()
> 	ThisForm.oAP.PostPtAccrual(v_apinvoice1.Apinvoiceid,v_apinvoice1.invRecDate)
> 	thisform.Release()
> ELSE
> 	ThisForm.oAP.PostAPInvoice_(v_apinvoice1.Apinvoiceid,v_apinvoice1.sessiondate)
> 	thisform.txtduedate.setfocus
> ENDIF

>
> thisform has defined a property oAP that is setted with .NULL. value
> postptaccural() function is present in cap.prg program.
>
> when executing the line
>
>

ThisForm.oAP.PostPtAccrual(v_apinvoice1.Apinvoiceid,v_apinvoice1.invRecDate)

> I am getting error as "Property PostPtAccural is not found"
>
> Please help me to correct this error.


You can't call a function like the way you call it. Just call its name:

...
IF !EMPTY(ThisForm.txtRecDate.Value) AND !EMPTY(ThisForm.txtVendorinvoicenumber.Value) AND thisform.checkduedate()
   PostPtAccrual(v_apinvoice1.Apinvoiceid,v_apinvoice1.invRecDate)
   ...

And I hope you have SET PROCEDURE TO CAP.PRG line somewhere in your main PRG.
-----------------
Borislav Borissov

Against Stupidity the Gods themselves Contend in Vain - Johann Christoph Friedrich von Schiller
The only thing normal about database guys is their tables.