Diagnosis
During manual planning you can navigate between the overview and periodscreens and also to the screen between the different characteristiclevels. As long as you do not leave the overview or period screen, thelocked data or total cells will be temporarily stored in a programbuffer (not in the database) every time you change screens. Thisensures that the cells remain locked if you return to a screen with acertain combination of characteristics for which the cells were alreadylocked. The buffer cannot remain intact if the settings for thelead columns that have not yet been displayed are changed (for example,by displaying subtotals).

System Response
If the settings for the lead columns are changed, the buffer containingall the locked cells from the screens processed so far will be deleted.If you navigate back to one of these screens later, the cells that werelocked before will no longer be locked.
If you do not change the settings the buffer will stay as it is. If younavigate back to a screen that has already been processed, the cellsthat were locked before will still be locked.

Procedure
When you first enter the overview screen, select the lead columnsetting that you require. If possible, do not change this settingduring the course of manual planning or only change it if you are sureyou no longer need to navigate back to the period screen or to acharacteristics combination that you have already processed in theoverview screen. If you do this, the buffer will be deleted and thenrecreated.