>Here is the code...
>
>Dialog = 4 + 32 + 256
>* 4 = Botones Sí y No
>* 32 = Icono del signo de interrogación
>* 256 = El segundo botón es el predeterminado
>nRec = recno("reclamos")
>sele valid_rcl && Copy from Reclamos, use to looking up the value repit
>locate for thisform.poste.value=poste and thisform.elementos.value=idelemento and thisform.fallas.value=idfalla and estado_act="01" and !recno("valid_rcl")=nRec
>if found()
> nodefault && To prevent the usual LostFocus from acting
> resp =messagebox("El Reclamo que esta Tratando de Agregar, ya esta en la Base de Datos.",Dialog,"Control de Reclamos")
> thisform.poste.setfocus()
> if resp = 6
> thisform.refresh()
> endif
>endif

Anyway I have to leave in few minutes, and have no time to look at this right now. I hope someone else will help you here. However, I have a concern: few days ago you posted exactly the same code and didn't give any written explanations what this code should do.