[Kipow]

Yo lo hago asi, en el evento CheckifBooleanField.

Código Delphi [-]

function Tfrm_MantTipoTransaccion.jvDBGTransaccionesCheckIfBooleanField(Grid: TJvDBGrid;
  Field: TField; var StringForTrue, StringForFalse: string): Boolean;
begin
  inherited;
  result := Field = dmINV.TTransaccionCOSTOS;
  StringForTrue := 'S';
  StringForFalse := 'N';
end;