Hi @Vishwas!
I imagine this could be that for some dimension level there are no issues. Please try to wrap the function in the following CASE condition.
CASE WHEN ([Measures].[Issues last updated], [Time].CurrentHierarchy.DefaultMember) > 0
THEN
Tail(
Filter(
[Time].CurrentHierarchy.Levels("Day").Members,
[Measures].[Issues last updated] > 0
)).Item(0).StartDate
END
If this does not work, please export report definition and send it to support@eazybi.com (mention that we are discussing it in this community thread).
Lauma / support@eazybi.com