+# GetPreviousSerialid
+my $serialid1 = NewIssue( 1, $subscriptionid_from_my_branch, $biblionumber, 2 );
+my $serialid2 = NewIssue( 2, $subscriptionid_from_my_branch, $biblionumber, 2 );
+my $serialid3 = NewIssue( 3, $subscriptionid_from_my_branch, $biblionumber, 2 );
+is( GetPreviousSerialid( $subscriptionid_from_my_branch ), $serialid2, "get previous serialid without parameter");
+is( GetPreviousSerialid( $subscriptionid_from_my_branch, 1 ), $serialid2, "get previous serialid with 1" );
+is( GetPreviousSerialid( $subscriptionid_from_my_branch, 2 ), $serialid1, "get previous serialid with 2" );
+is( GetPreviousSerialid( $subscriptionid_from_my_branch, 3 ), undef, "get previous serialid with 3, does not exist" );
+
+$schema->storage->txn_rollback;