--- /dev/null
+-- @tag: customer_vendor_taxzone_id
+-- @description: Die Spalte "taxzone_id" in den Tabellen customer und vendor darf nicht NULL sein.
+-- @depends: release_2_4_1
+UPDATE customer SET taxzone_id = 0 WHERE taxzone_id ISNULL;
+ALTER TABLE customer ALTER COLUMN taxzone_id SET DEFAULT 0;
+ALTER TABLE customer ALTER COLUMN taxzone_id SET NOT NULL;
+
+UPDATE vendor SET taxzone_id = 0 WHERE taxzone_id ISNULL;
+ALTER TABLE vendor ALTER COLUMN taxzone_id SET DEFAULT 0;
+ALTER TABLE vendor ALTER COLUMN taxzone_id SET NOT NULL;