... document number. When you setup the value of this field to ‘X’, then the column(s) will be always visible. While scrolling the fields after the last field which has this flag will be moving left or right. ...
If you want to setup current field as a key one, you need to fill KEY with ‘X’. When you’ll do this then the field will have blue background and during horizontal scrolling the column will be fixed.
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When you use CL_GUI_ALV_GRID in edit mode or you change your internal table used to display data on ALV grid it may happen that after refreshing the grid using refresh_table_display your cursor or scroll ...