The planning history is only enabled if the project default ZP_PL_HIST is set to Y. In this case, any change of information related to a planned tagged item or a planned requisition is recorded. This recording includes changes to the planned item itself as well as to its milestones, and it covers updates and deletions. Insertions are not logged in this history.
Click the Planning task on the dashboard, or select Planning from the Tasks list.
Select a planning item in the tree.
The planning item details appear on the right panel.
Click View Planning History at the bottom.
The Planning History window opens displaying the history records.