diff --git a/src/main/resources/db/changelog/5-hs-office/503-relation/5030-hs-office-relation.sql b/src/main/resources/db/changelog/5-hs-office/503-relation/5030-hs-office-relation.sql
index 813c6565..80290067 100644
--- a/src/main/resources/db/changelog/5-hs-office/503-relation/5030-hs-office-relation.sql
+++ b/src/main/resources/db/changelog/5-hs-office/503-relation/5030-hs-office-relation.sql
@@ -32,6 +32,7 @@ create table if not exists hs_office.relation
 
 -- ============================================================================
 --changeset michael.hoennig:hs-office-relation-unique-constraints endDelimiter:--//
+--validCheckSum: 9:79e93a47a62e44c661cd8d414626e49d
 -- ----------------------------------------------------------------------------
 
 CREATE UNIQUE INDEX unique_relation_with_mark
@@ -49,6 +50,36 @@ CREATE UNIQUE INDEX unique_partner_relation
 --//
 
 
+-- =====================================================================================
+--changeset timotheus.pokorra:hs-office-relation-debitor-anchor-CONSTRAINT endDelimiter:--//
+-- -------------------------------------------------------------------------------------
+
+--
+-- Name: relation_check_debitor_anchor_partner(RelationType, uuid); Type: FUNCTION; Schema: hs_office; Owner: test
+--
+
+CREATE FUNCTION hs_office.relation_check_debitor_anchor_partner(mytype hs_office.RelationType, debitoranchoruuid uuid) RETURNS boolean
+    LANGUAGE plpgsql
+    AS '
+declare
+    countPartner integer;
+begin
+    if mytype = ''DEBITOR'' then
+        SELECT COUNT(*) FROM hs_office.relation r
+            WHERE r.type = ''PARTNER'' AND r.holderuuid = debitoranchoruuid
+            INTO countPartner;
+        if countPartner < 1 then
+            raise exception ''[400] invalid debitor relation: anchor person must have a PARTNER relation'';
+        end if;
+    end if;
+    return true;
+end; ';
+
+ALTER TABLE hs_office.relation ADD CONSTRAINT check_debitor_anchor_person CHECK (hs_office.relation_check_debitor_anchor_partner(type, anchorUuid));
+
+--//
+
+
 -- ============================================================================
 --changeset michael.hoennig:hs-office-relation-MAIN-TABLE-JOURNAL endDelimiter:--//
 -- ----------------------------------------------------------------------------