However, given the information you provide, I would suggest that in this case a "can" refers to your 398ml can.
Finally, to answer the part about the can: The most common can size for beans is about 15 ounces, which, once drained, contains approximately 1.5 cups or 9 ounces of beans (this holds across all bean types I tested).
One 15-ounce can of drained canned beans equals 1 1/2 cups of drained cooked dried beans.
Great Northern Bean Measurements 1 pound of dried beans = 3 cups of dried beans = 6 – 7 cups of cooked beans. 1 2/3 - 2 cups of cooked beans = 1 can of canned (14 - 16 oz.)