=item columnvalue - default or fixed value for the column
=item columnvalue - default or fixed value for the column
-=item columnflag - null, D, F, X (virtual fields)
+=item columnflag - 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. For virtual fields, can also be 'X' for excluded.