-=item I<svcdb>__I<field>_flag - defines I<svcdb>__I<field> action: null or empty (no default), `D' for default, `F' for fixed (unchangeable), `M' for manual selection from inventory, or `A' for automatic selection from inventory.
+=item I<svcdb>__I<field>_flag - defines I<svcdb>__I<field> action: null or empty (no default), `D' for default, `F' for fixed (unchangeable), , `S' for selectable choice, `M' for manual selection from inventory, or `A' for automatic selection from inventory. For virtual fields, can also be 'X' for excluded.