--- /dev/null
+package SL::DB::Manager::Invoice;
+
+use strict;
+
+use base qw(SL::DB::Helpers::Manager);
+
+sub object_class { 'SL::DB::Invoice' }
+
+__PACKAGE__->make_manager_methods;
+
+sub type_filter {
+ my $class = shift;
+ my $type = lc(shift || '');
+
+ return (or => [ invoice => 0, invoice => undef ]) if $type eq 'ar_transaction';
+ return (and => [ invoice => 1, amount => { ge => 0 }, or => [ storno => 0, storno => undef ] ]) if $type eq 'invoice';
+ return (and => [ invoice => 1, amount => { lt => 0 }, or => [ storno => 0, storno => undef ] ]) if $type eq 'credit_note';
+ return (and => [ invoice => 1, amount => { lt => 0 }, storno => 1 ]) if $type =~ m/(?:invoice_)?storno/;
+ return (and => [ invoice => 1, amount => { ge => 0 }, storno => 1 ]) if $type eq 'credit_note_storno';
+
+ die "Unknown type $type";
+}
+
+1;