"xxx" is used to name both a type1 and a type2. Duplicate names like this may cause confusion for developers and users.

The same name was used to name both a Field and Measure, or a Variable and Measure

Using the same name for two resources, for example using "Sales" for both a Field and Measure, can appear ambiguous when used in an expression. 

          Sales + Margin

Is "Sales" a measure or a field?