End users were not able to edit a top level (parent) cell that had a combination of:
A simple (or composite) list with writable child items but at least one child item read only with Dynamic Cell Access (DCA);
Breakback enabled on the line item.
An error occurred when an end user attempted to enter a value into the cell at the parent level of the hierarchy.
When a workspace admin entered a value into the cell at the parent level of the hierarchy, breakback only occurred for that value over the cells to which the workspace admin was granted write access.