!exists $check_tsv_done{$commod,$stall} or
&$bad_data("repeated data ".errsan($commod).",".errsan($stall));
$check_tsv_done{$commod,$stall}= 1;
!exists $check_tsv_done{$commod,$stall} or
&$bad_data("repeated data ".errsan($commod).",".errsan($stall));
$check_tsv_done{$commod,$stall}= 1;