If you take your separate concentrates (or any raw materials) and allocate them as input materials to a works order, that works order will produce 1 output batch - with a single batch number, BBE and production date.
It's conventional to apply a BBE as the production date plus a time delay, so production date plus one year, for example.
Sometimes you can hit a situation where the BBE applied to your output batch exceeds the BBE for one or more batches of raw material used. Where this is the case, you'd need to decide how to handle that based on risk assessment. Blending and/or processing of raw materials to produce a composite product may mean that the BBE of the input materials is not relevant to the finished product (e.g. if quality deterioration is not detectable in the finished product over the course of its assigned shelf life). Alternatively, the BBEs for input materials may present a limiting factor for the life of the composite product.
For example - one of your input juice concentrates may have a colour change or a change in acidity over the course of its shelf life, but no deterioration that would affect food safety. The shelf life that you could apply to your composite product would depend primarily on whether those changes were detectable in the blended product.
As an alternative example, if you were to blend several types of nut to make a snacking mix, rancidity would be likely to be detectable in the finished product mix - dictated by the shortest life of the input material batches - so in that situation it would be better to limit the shelf life of the composite product based on the remaining life on the raw materials.
Hope this helps.
Edited by Duncan, 14 October 2021 - 09:04 AM.