my @hidden_variables = map { "l_${_}" } @columns;
push @hidden_variables, qw(warehouse_id bin_id partnumber description chargenumber bestbefore qty_op qty qty_unit l_warehousedescription l_bindescription);
my @hidden_variables = map { "l_${_}" } @columns;
push @hidden_variables, qw(warehouse_id bin_id partnumber description chargenumber bestbefore qty_op qty qty_unit l_warehousedescription l_bindescription);