Hello Pavel,
the issue is:
a) as-is (selection variable offer only on cc for data entry).
1-Start query, select cost center 4711, enter data and store.
2-Select cost center 4712, enter data and store.
b) with multiple selection
Start query, select from 4711 to 4712 => data cannot be entered anymore.
The fields are grey now.
With kind regards
Thomas