In the Clarity Modern UX, users encounter an error when attempting to edit the COST attribute directly within a Cost Plan Details Summary Row if child records are present.
org.apache.commons.jelly.JellyTagException: null:234:91: <core:invoke> method doPatch threw exception: 400 revmgr.summaryDetailRowEditingNotAllowed Summary Detail record cannot be edited
v16.1.1 and above
This behavior is by design to maintain data integrity.
When a summary row contains child records (detailed rows), it functions as a calculated total of those children. The system restricts direct editing of the COST attribute on the summary row to prevent data discrepancies between the displayed total and the sum of the underlying child records.