Additional Recipient Amount Check

[joYyHack]

Hello! There is a function in the protocol called _transferERC20AndFinalize. As I got it right, basically it just sends any amount of tokens to the additional recipients and then the remainder is sent to the main recipient (seller). What if the token amount of some additional recipient will be much higher than the remainder that has to be sent to the main recipient? I didn't find any verification that checks additional recipients' amount related to the main recipient. Is the check done on the back-end side?