I'm unable to edit my Roadmap item totals such as Total Capital Cost or Total Operating Cost when my Totals Columns in View Options is set to Grand Totals instead of Sum of Periods.
This is working by design. If Totals Columns is set to Grand Totals, you will not be able to edit the fields. This is referenced at: Change Impact and Upgrade for 15.9.2
Release : 15.9.2 and higher
Component : CLARITY ROADMAPS
In View Options, make sure that for Totals Columns, Sum of Periods is selected versus Grand Totals.
To check this:
See screen shot below: