A batch is a set of instances that have the same material code and the same batch number. The batch number here is the one allocated automatically by the system. This is distinct from your suppliers’ batch numbers. It is important to appreciate that a batch is not a single thing. It might start off as a single delivery from a supplier, for example, but it can become split through use. This is especially true for bars, extrusions and sheets where their use involves cutting it up. When looking at your inventory list it is common to see multiple entries with the same batch number.