Flowering Orchid - Beallara - Miltassia

Our flowering Thai Orchid, which incidentally was sold as an Oncidium, is either a Beallara or a Miltassia.
If our flowering orchid is indeed a Beallara then it may be Peggy Ruth Carpenter – “Morning Joy”. That orchid was apparently bred from Beallara Tahoma Glacier “Green” and Miltonia “Purple Queen”.
If our flowering orchid is a Miltassia, then it is a cross between a Miltonia and a Brassia, the hybrid name unknown. Perhaps someone can shed some light on this. Whatever the true parentage of this orchid is, we think it’s an extremely beautiful flower which has now been given pride of place in our garden, even though it is not an orchid that is native to Thailand.