A project cost plan is zeroing out the planned cost totals.
Release : 15.9.1
Component : CA PPM SAAS FINANCIAL MANAGEMENT
This is by design.
If the View options Start Date is modified, e.g. from Jan to Feb, it will zero out the cost plan duration for the prior months.
This can be supported by setting the audit trail on the cost plan object attributes Start and Finish Dates.
Repopulate using the Populate from Team or Task Assignments options or re-enter the information manually.