Timeline page in Road map items does not display data.
The following message gets generated in the browser trace of the Developer tool.
"API-1057 : An attribute needs to be groupable or aggregatable to be used in group by or aggregation respectively. Attributes used in ''groupBy'' and ''aggr'' must be present in fields. ''sort'' and ''expand'' cannot be used with ''groupBy''."errorCode "api.invalidGroupByQuery"
This is because the feature toggle that is meant for aggregation of sql curves i.e. TSV_AGGREGATION_FEATURE_20550 is not enabled which is the reason for API call failure.
Release : 15.9.2
Component : Clarity Roadmaps
Enabled the feature toggle and refreshed the Clarity caches.
Here is a KB article that provides information on how to enable the toggle feature;