Open solution explorer.
Under Components, expand Entities, and then expand the entity you want.
Select either 1:N Relationships or N:1 Relationships.
In the main pane, in the Type list, select Mappable.
Select a mappable relationship. Then, on the Actions toolbar, select Actions, and then select Edit.
Under Related, select Mappings.
For each new mapping, on the Actions toolbar, select New.
In the Create Field Mapping dialog box, select the source field from Source Entity Fields. Select the target field from Target Entity Fields.
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