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Writing a Supply Method for a Business Object
Property 
You can use this procedure to define the behavior of a business object property by writing a supply method.

You can write a supply method to perform calculations during runtime when results need not be stored in the user database.
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1. In Solution Explorer, click the required business object property with the secondary mouse button and choose View Designer.
The Document Outline window and the BO Designer appear.
2. In the Properties window, in the Data Assoc Type field, select Supply Method.
A supply method is created.
3. In Solution Explorer, click the business object property with the secondary mouse button and choose View Code.
The Code Designer appears.
4. Write code in the appropriate location within the Code Designer.
5. Choose Save.