The Workflow extensions list has a set of extensions that should be applicable on all workflow based resource types (e.g. Encounter). - These extensions are accurately listed on the encounter extensions page.

However the actual extensions do not have their context set to support them being used on those resource types.

e.g. 

http://build.fhir.org/extension-workflow-supportinginfo.html

PA is requesting that this above extension have its context of use include Encounter (as we don't plan to add in the supportingInfo property as a native property - usually this would be on appointment or ServiceRequest)