+$csv = SL::Helper::Csv->new(
+ file => \<<EOL,
+description;longdescription;datatype
+name;customernumber;datatype
+Kaffee;"lecker Kaffee";P
+Meier;1;C
+Bier;"kühles Bier";P
+Mueller;2;C
+EOL
+# " # make emacs happy
+ profile => [
+ {class => 'SL::DB::Part', row_ident => 'P'},
+ {class => 'SL::DB::Customer', row_ident => 'C'},
+ ],
+ ignore_unknown_columns => 1,
+);
+$csv->parse;
+is $csv->_multiplex_datatype_position, 2, 'multiplex check detects datatype field position right';
+
+is_deeply $csv->get_data, [ { datatype => 'P', description => 'Kaffee', longdescription => 'lecker Kaffee' },
+ { datatype => 'C', name => 'Meier', customernumber => 1},
+ { datatype => 'P', description => 'Bier', longdescription => 'kühles Bier' },
+ { datatype => 'C', name => 'Mueller', customernumber => 2}
+ ],
+ 'multiplex: datatype not at first position works';
+
+#####
+
+$csv = SL::Helper::Csv->new(
+ file => \<<EOL,
+datatype;description;longdescription
+name;datatype;customernumber
+P;Kaffee;"lecker Kaffee"
+Meier;C;1
+P;Bier;"kühles Bier"
+Mueller;C;2
+EOL
+# " # make emacs happy
+ profile => [
+ {class => 'SL::DB::Part', row_ident => 'P'},
+ {class => 'SL::DB::Customer', row_ident => 'C'},
+ ],
+ ignore_unknown_columns => 1,
+);
+ok !$csv->parse, 'multiplex check detects incosistent datatype field position';
+is_deeply( ($csv->errors)[0], [ 0, 'datatype field must be at the same position for all datatypes for multiplexed data', 0, 0 ], 'multiplex data with inconsistent datatype field posiotion throws error');
+
+#####
+