ولا بالسويق
Translation: Nor may wheat be sold for its own roasted meal.
Sawiq is a meal commonly produced by roasting and grinding grain. Where it is made from wheat, the original material connection survives but roasting and milling prevent confident equivalence between the whole grain and the processed product.
One measured volume of wheat for one volume of wheat-based sawiq does not pass merely because the vessels match. The ruling concerns wheat and its own processed derivative; it should not be extended uncritically to a meal made from a different grain.