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Material Number Format Conversion 
You can set different formats for material numbers. This means that you can have one main format and then different variations on it to use in your Web shop, for example to simplify the format for customers to enter in the shop.
You define material number formats in your backed ERP system.
In...
1. In Customizing select Logistics - General ® Material Master ® Basic Settings ® Define Output Format of Material Numbers.
2. Define the length of the material numbers and, if required, a material number template.
3. Specify the form in which the numbers should be stored.
4. Specify whether the numbers should contain leading zeroes.

For more information, see the documentation fort he Customizing activity.