[OASIS Issue Tracker] Created: (ODATA-476) Clarify that type-cast segments are NOT required for properties of derived types in system query options

Clarify that type-cast segments are NOT required for properties of derived types in system query options
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                 Key: ODATA-476
                 URL: http://tools.oasis-open.org/issues/browse/ODATA-476
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Improvement
          Components: OData URL Conventions 
    Affects Versions: V4.0_CS
         Environment: [Proposed]
            Reporter: Ralf Handl


We allow type-cast segments in expressions, but we don't specify whether they are required.

As a property name is unique within an instance, the type-cast segment is not necessary for evaluating the expression.

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