Make "Service Type" from the Service object available via AQL query

Issue Summary

When constructing AQL queries that access attributes from the Service object contained within the built in Services schema, it is not possible to query against "Service Type"

Steps to Reproduce

1. Create or navigate to an existing schema
2. Create or update an object in that schema of objectType Service
3. Create an AQL statement that returns objects having an outbound ref to a Service object and the Service Type attribute of the Service object is the desired value (Applications, Business Services, Capabilities, Software Services)

Expected Results

You would return all objects which contain a Service object where its Service Type equals the values from the query (e.g. Applications).

Actual Results

This is currently not possible because "Service Type" does not appear to be exposed as an attribute that can be queried against.  You can do this with any of the Service attributes that are listed when viewing a Service object, but "Service Type" is only visible/shown when you click Edit on a Service object or when creating a new one.

For example, the following AQL works, using one of the existing Service attributes.

object HAVING outR(objectType = Service) AND (Service.Revision = 1826499999)  

Workaround

No known workaround at this time.