When allocation percentage does not add up to 100%, you can set auto allocation with the option 'Enable remainder'.

It distributes remaining inventory evenly across channels, as per priority*.


With the same allocation

UnassignedBrand.comShopeeTmall
Priority-321
Allocation50%10%0%
Enable remainder : No
Quantity4050100
Enable remainder : Yes
Quantity050+1410+130+13


*priority : the larger the number, the higher the priority

Remaining stock will be distributed to each channel one by one, as per priority.