When Forge maps a source property value to a dimension value, the dimension value it uses can either be explicitly defined in the dimension hierarchy or automatically generated by Forge. You control this behavior by using match modes.
About choosing a match mode for dimensions
In Developer Studio, you set the type of dimension value handling, on a per mapping basis, by selecting a mode from the Match mode list in the Dimension Mapping editor, as illustrated below:
Rules of thumb for dimension mapping
When you choose the match mode to use for generating your dimension values, keep in mind the following two rules of thumb:
Dimension mapping example
The following illustration shows a simple dimension mapping example that uses a combination of generation methods. The sections after the illustration describe the mapping behavior in the example.