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Use
When creating a multi-store order you can transfer the stores of the sold-to party to the document (according to certain criteria).
Prerequisites
You have mapped the interdependence of the stores to a sold-to party in the system.
See also:
Assignment of Stores to the Sold-to Party of an MSOFeatures
If the MSO sold-to party is a large company with many stores, you should group the stores in the document.
You can freely choose the criteria to do that.

A company wants to supply all stores with certain sizes of a style of jeans. The sold-to party orders a larger quantity per size for bigger stores and smaller quantities for smaller stores. You can map this in the system by first transferring the smaller stores to the document, using the MSO mix 1. You assign an item with the material 'jeans' and enter how many pieces the stores should get per schedule line. You must repeat this procedure for the larger stores with MSO mix 2.

Another sold-to party wants to directly supply some of their stores, but a distribution center should make the further processing for the remaining stores. You can map this in the system by transferring all stores to the document that you should directly supply, using an MSO mix S. In mix M you combine those stores that you have reserved to be delivered by the customer's distribution center.
You uniquely distinguish your MSO mixes in the documents by using a key. You can name the key as you like.
You assign items to a MSO mix by assigning the key to the item.

It is mandatory to use an MSO mix for creating a multi-store order. Even if you do not group the stores in the document you must use an MSO mix. However, in this case you can transfer all stores to a mix and assign the required materials to the mix.
You can assign the same store to several MSO mixes in the same document. This is advantageous if your ordering party has ordered different materials that should not be delivered to all stores.

Your ordering party orders men’s and ladies’ slacks. Some of the stores are men’s clothing stores, other department stores have only ladies’ wear and some sell both.
You can map this in the system by using two MSO mixes. You assign the material 'men’s slacks' to one mix and to the other the material 'ladies’ slacks'. For the stores that should get both men’s and ladies’ slacks, you enter both mixes. You assign the other stores respectively to one of the mixes.