But your lot size is 0.1, which is less than 0.3, you should see a trade with 0.1 lots. The upper limit is the maximum lot size that the block could take, in case the requested lot size is bigger. Yours is not bigger, it is 0.1, but sometimes people use let's say Martingale, where the lot size is changing (and growing) - in this case an upper limit is probably a good idea.