Cross Selling Functionality in SAP is very frequently used when customers place their sales orders via telephone call.
For example if a customer orders a specific shirt, the salesperson can use this functionality to suggest few more products which customer may wish to buy. For example, for a shirt, salesperson can suggest a trouser, a tie or a belt.
In SAP, famous condition technique is used to configure this Cross Selling functionality. (Click here to read more on that)
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Cross Selling Functionality in SAP