I see a lack in the current implementation of the REST webservices of SDM, when trying to fetch data with a given wherecause.
Currently the wherclauses cannot contain dotted attribute conditions, so only first level-attribute-conditions can be used.
That means, for example, you are not able to fetch all tickets for a certain site of the affected enduser of the tickets
This could easaly expressed in a majic query like "customer.location.site.name='Islandia'", which is supported in all other application layer of SDM.
Additionaly, it may make sense to support dotted attributes in the "attributes to read" (X-Obj-Attrs header) list as well