diff --git a/installer/data/mysql/atomicupdate/bug_21730.perl b/installer/data/mysql/atomicupdate/bug_21730.perl
new file mode 100644
index 0000000000..cb8db7bb2b
--- /dev/null
+++ b/installer/data/mysql/atomicupdate/bug_21730.perl
@@ -0,0 +1,9 @@
+$DBversion = 'XXX';  # will be replaced by the RM
+if( CheckVersion( $DBversion ) ) {
+    # you can use $dbh here like:
+
+    $dbh->do( "INSERT IGNORE INTO authorised_value_categories (category_name) VALUES ('PA_CLASS');");
+
+    SetVersion( $DBversion );
+    print "Upgrade to $DBversion done (Bug 21730: Add new authorised value category PA_CLASS)\n";
+}
diff --git a/installer/data/mysql/mandatory/auth_val_cat.sql b/installer/data/mysql/mandatory/auth_val_cat.sql
index 4ab8c0e04e..c4ce39a634 100644
--- a/installer/data/mysql/mandatory/auth_val_cat.sql
+++ b/installer/data/mysql/mandatory/auth_val_cat.sql
@@ -16,6 +16,7 @@ INSERT IGNORE INTO authorised_value_categories( category_name )
     ('TERM'),
     ('ITEMTYPECAT'),
     ('PAYMENT_TYPE'),
+    ('PA_CLASS'),
     ('ROADTYPE');
 
 INSERT IGNORE INTO authorised_value_categories( category_name )