I have created a board for a project, which includes only issues and subtasks from a single epic. The filter I'm using is:
project = COM AND (issuetype = Story AND parentEpic IN (COM-946)) OR (issuetype = sub-task AND parentEpic IN (COM-946)) ORDER BY Rank ASC
This works, it lists all the issues I want to see in the Kanban board.
For some reason, the timeline does not work, it gives me an error message saying:
"Timelines can only contain issues from one project. To create an agile plan across multiple teams and projects, try Plans in Jira Premium.
To use this timeline, edit your board filter to include issues from [PROJECT NAME] only"
All the issues that are listed in the filter view are starting with COM, so what could be the problem here?