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Overriding a Segment Field 
You can use this procedure to override the segment field name of a BO property when the BO is used as:
· A join BO in a business object relationship
· An underlying BO in a business query
You need to override the segment field name only if it mismatches with the segment field name of the corresponding property of a BCOL.

You can use more than one BO (join BOs) in a business object relationship or business query to retrieve a BCOL through the BDoc segments assigned to them. The BCOL that is constructed by a relationship or a query is a subset of the properties of these join BOs. Therefore, if the property (P1) of a join BO is updated, then the corresponding property (P2) in the BCOL must be updated automatically. However, if the segment field names of P1 and P2 do not match, then the BCOL property is not updated. Therefore, you must override the segment field name of P1 with the segment field name of P2.
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1. In Solution Explorer, perform one of the following steps:
¡ If you want to override the segment field name through a relationship, then click the required business object with the secondary mouse button and choose View Relationship.
¡ If you want to override the segment field name through a business query, then click the required business query with the secondary mouse button and choose View Designer.
The corresponding designer window appears.
2. In the Properties window, in the Segment field Mapping property, choose the Browse button.
The Join Field Overrides window appears.
3. Select the required participating BO.
4. Specify the segment field name of the primary key.
5. In the grid, select the BO property for which you want to override the segment field.
The segment field that is associated with the BO property appears.
6. Select the BCOL segment field name.
