For SUoM-relevant products the alternative unit of measure (AUoM) is taken into account to determine the physical inventory differences, as well as the usual stock attributes.

If the UoM of the counted stock differs from the UoM of the book stock, the system creates two differences. In the first difference, the complete book stock with the old UoM is lost. In the second difference, the complete counted stock with the new UoM is found.

The system only accepts SUoMs for entering count results. You cannot count stock with identical stock attributes but different AUoMs in the same bin or in the same HU, as the quants are not separated by the AUoM. The system rejects count entries which it cannot process because of this. However if a counter actually finds stock with different AUoMs in a bin, the stock must be distributed to different bins manually.

You can count stock of a single AUoM together with stock in the base UoM in order to support partial quantities of the AUoM. The quantities of the count entry are summed up in the AUoM.

It is still possible to count stock of a product with different UoMs on the same bin if the stock is packed into different HUs.

When the stock is only managed in the base UoM in the storage type, the count result is always saved in the base UoM and the differences are always created in the base UoM. This behavior depends on the setting you make for the field Quant Addition to Stock AUoM in Storage Bin/HU in Customizing for Extended Warehouse Management under  Master Data Define Storage Type . If you select 2 – Allowed – Manage Stock in BUoM Only the system accepts any SUoM as a count entry. As the stock is only managed in base UoM, the differences are created in base UoM and the stock on the bin will always stay in base UoM.