Thanks for the suggestion, Jenny.
Breww’s auto-allocate shouldn’t ever “steal” stock that’s already assigned to another order, so that won’t be what’s happening here. Also, trying to manually assign a keg to a delivery that’s already been assigned to a different delivery will be rejected (and the first delivery to have it assigned will keep it).
I’m not quite sure how you’ve got to the situation that you’re describing, to be honest, but we’re actually planning to start building Pallets for grouping stock and assigning/moving as a group very soon, so I’d be tempted to suggest we put this on hold until after that’s built as it might well solve the problem (and give you all the benefits of proper support for pallets). How does that sound?