How to query Hierarchical Requirements by a Custom Field on the Capability

Discussion created by 34ef255f48d26b9bf7afcd6631be94711 on Nov 19, 2014
Latest reply on Dec 4, 2014 by 34ef255f48d26b9bf7afcd6631be94711
We have a custom field c_ECPPlatformRelease on our capabilities.. I'm trying to grab all user stories that fall under a feature that's under a capability that has a certain value in that custom field. So on https://rally1.rallydev.com/slm/doc/webservice/ I went to Hierarchical Requirement section and tried to query on (Feature.Parent.c_ECPPlatformRelease = "Q4 2014") but in the JSON response I get an error 'Could not read: could not read all instances of class com.f4tech.slm.domain.UserStory' -- I have no idea what this means.