my $params = delete($::form->{part}) || { };
delete $params->{id};
- # never overwrite existing partnumber, should be a read-only field anyway
- delete $params->{partnumber} if $self->part->partnumber;
+ # never overwrite existing partnumber for parts in use, should be a read-only field in that case anyway
+ delete $params->{partnumber} if $self->part->partnumber and not $self->orphaned;
$self->part->assign_attributes(%{ $params});
$self->part->bin_id(undef) unless $self->part->warehouse_id;