Scrolling Within ABAP List-Based PI Sheets 
Use
To improve system performance when maintaining long PI sheets, only a section of a PI sheet is displayed at a time. For this reason, you need to observe the following when displaying data on a PI sheet:
A default value for the number of phases to be displayed is defined in Customizing for the operating group (control recipe destination). You can change this value when maintaining a specific PI sheet; see Changing the Sections Displayed in a PI Sheet .
The changed value is only valid until you leave the PI sheet.
Each time the PI sheet is prepared for display, that is, whenever you choose Enter or choose a function, the current cursor position is taken as the middle of the section to be displayed.
The scroll bar as well as the scroll keys and symbols can only be used to scroll within the section currently displayed. You can, however, branch to another section via the menu; see Scrolling Between Sections of ABAP List-Based PI Sheets .