+sub mtime_ischanged {
+ my ($self, $table, $option) = @_;
+
+ return unless $self->{id};
+ croak ("wrong call, no valid table defined") unless $table =~ /^(oe|ar|ap|delivery_orders|parts)$/;
+
+ my $query = "SELECT mtime, itime FROM " . $table . " WHERE id = ?";
+ my $ref = selectfirst_hashref_query($self, $self->get_standard_dbh, $query, $self->{id});
+ $ref->{mtime} ||= $ref->{itime};
+
+ if ($self->{lastmtime} && $self->{lastmtime} ne $ref->{mtime} ) {
+ $self->error(($option eq 'mail') ?
+ t8("The document has been changed by another user. No mail was sent. Please reopen it in another window and copy the changes to the new window") :
+ t8("The document has been changed by another user. Please reopen it in another window and copy the changes to the new window")
+ );
+ ::end_of_request();
+ }
+}
+