Hi guys, many thanks for your answers ...
This is the pt query's sql:
Select r.Referencia as referencia, r.Descripcion as referenciaDescripcion,
r.Producto as producto, r.Talla as talla, r.Color as color, c.Nombre as colorNombre,
r.PrecioRefSinIva as precioRefSinIva, r.TasaIva as tasaIva...