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Product Substitution 
The system can replace one product with another one automatically within order entry. This enables you to support seasonal sales promotions, for example.
Product substitution is available to you in CRM Enterprise, in the Interaction Center WinClient, in Internet Sales, and in Channel Management.
· You have set up product substitution (or material determination) in SAP R/3, and downloaded this to SAP CRM. You can find more information in the Implementation Guide under Customer Relationship Management ® Basic Functions ® Product Substitution.
· You have assigned the product substitution procedure to a transaction type in Customizing.
The system can automatically replace a product that has been entered manually by another one.

At Christmas, you wish to sell your products with special packaging. If a customer buys these products at Christmas time, the required product is replaced by the product with the special packaging.
If the system finds several possible products, then you can select the one that is suitable.

Product substitution is not carried out as a result
of the availability situation, this means, a product that is not available is
not substituted by one that is available.
The
Rules-based
Availability Check is available to you for this.
You can only use product substitution in the CRM Internet Sales business-to-business scenario.
See also:
You can find more information on material determination in SAP R/3 in the SAP Library under Logistics ® Sales and Distribution ® Basic Functions in Sales ® Material Determination.