@cazzie If something in a recipe uses liters, you know it is liquid. If something in a recipe says grams you know it is weight. In our measure the word ounce is used in both types of measures (by the way I think we are ageeing, and maybe my original wording is either written poorly or simply we would organize the sentence differently). There are 16 ounces in a pound, and there are 8 ounces in a cup. In America typically liquid and dry measure in a recipe is given in cups, not weight. However, if something comes in a can, bottle, or small box, sometimes the net weight of the box is used in a recipe. For instance a recipe might call for a one pound box of confectioners sugar, or a 10¾ ounce can of cream of mushroom soup, and so on. But, with grain I would doubt the box or bag is being referenced. What is odd is in America it is very very rare to see a recipe call for ounces for liquid or dry measure because it is customary to use cups, fraction of a cup, or tablespoons and teaspoons. It is very common for grain measure to be by cups. One cup rice to two cups water. One cup oatmeal to 3 cups water, etc.
So, in conclusion, as an American, it is difficult to be sure, because it would be an unlikely measure in a recipe here.