diff --git a/hsarback/database/schema.sql b/hsarback/database/schema.sql
index 947c22c..4ffc9fd 100644
--- a/hsarback/database/schema.sql
+++ b/hsarback/database/schema.sql
@@ -122,7 +122,7 @@ CREATE TABLE business_partner (
     uid_vat character varying(20),
     CONSTRAINT ckc_member_id_business CHECK (((member_id >= 10000) AND (member_id <= 99999))),
     CONSTRAINT ckc_shares_signed_business CHECK ((shares_signed >= 0)),
-    CONSTRAINT ckt_business_partner CHECK ((((((member_since IS NULL) AND (member_until IS NULL)) OR ((member_since IS NOT NULL) AND (member_until IS NULL))) OR (((member_since IS NOT NULL) AND (member_until IS NOT NULL)) AND (member_since < member_until))) AND ((((member_code)::text ~~ 'hsh00-%'::text) AND (member_since IS NOT NULL)) OR (((member_code)::text !~~ 'hsh00-%'::text) AND (member_since IS NULL)))))
+    CONSTRAINT ckt_business_partner CHECK ( ( ((member_since IS NULL) AND (member_until IS NULL)) OR ((member_since IS NOT NULL) AND (member_until IS NULL)) OR ((member_since IS NOT NULL) AND (member_until IS NOT NULL) AND (member_since < member_until)) ) AND ((member_code)::text ~~ 'hsh00-%'::text))
 );