diff --git a/src/main/java/net/hostsharing/hsadminng/Stringify.java b/src/main/java/net/hostsharing/hsadminng/Stringify.java
index 7cde6757..4a665b1e 100644
--- a/src/main/java/net/hostsharing/hsadminng/Stringify.java
+++ b/src/main/java/net/hostsharing/hsadminng/Stringify.java
@@ -1,5 +1,7 @@
 package net.hostsharing.hsadminng;
 
+import net.hostsharing.hsadminng.errors.DisplayName;
+
 import javax.validation.constraints.NotNull;
 import java.util.ArrayList;
 import java.util.List;
@@ -28,7 +30,16 @@ public final class Stringify<B> {
 
     private Stringify(final Class<B> clazz, final String name) {
         this.clazz = clazz;
-        this.name = name;
+        if (name != null) {
+            this.name = name;
+        } else {
+            final var displayName = clazz.getAnnotation(DisplayName.class);
+            if (displayName != null) {
+                this.name = displayName.value();
+            } else {
+                this.name = clazz.getSimpleName();
+            }
+        }
     }
 
     public Stringify<B> withProp(final String propName, final Function<B, ?> getter) {
@@ -53,7 +64,7 @@ public final class Stringify<B> {
                 })
                 .map(propVal -> propName(propVal, "=") + optionallyQuoted(propVal))
                 .collect(Collectors.joining(separator));
-        return (name != null ? name : object.getClass().getSimpleName()) + "(" + propValues + ")";
+        return name + "(" + propValues + ")";
     }
 
     public Stringify<B> withSeparator(final String separator) {
diff --git a/src/main/java/net/hostsharing/hsadminng/hs/office/debitor/HsOfficeDebitorEntity.java b/src/main/java/net/hostsharing/hsadminng/hs/office/debitor/HsOfficeDebitorEntity.java
index 6c0cbe5f..5887b65f 100644
--- a/src/main/java/net/hostsharing/hsadminng/hs/office/debitor/HsOfficeDebitorEntity.java
+++ b/src/main/java/net/hostsharing/hsadminng/hs/office/debitor/HsOfficeDebitorEntity.java
@@ -7,6 +7,7 @@ import net.hostsharing.hsadminng.Stringifyable;
 import net.hostsharing.hsadminng.hs.office.bankaccount.HsOfficeBankAccountEntity;
 import net.hostsharing.hsadminng.hs.office.contact.HsOfficeContactEntity;
 import net.hostsharing.hsadminng.hs.office.partner.HsOfficePartnerEntity;
+import org.apache.commons.lang3.StringUtils;
 
 import javax.persistence.*;
 import java.util.UUID;
diff --git a/src/main/resources/db/changelog/250-hs-office-sepamandate.sql b/src/main/resources/db/changelog/250-hs-office-sepamandate.sql
index 144d0357..b87b872e 100644
--- a/src/main/resources/db/changelog/250-hs-office-sepamandate.sql
+++ b/src/main/resources/db/changelog/250-hs-office-sepamandate.sql
@@ -9,7 +9,7 @@ create table if not exists hs_office_sepamandate
     uuid                uuid unique references RbacObject (uuid) initially deferred,
     debitorUuid         uuid not null references hs_office_debitor(uuid),
     bankAccountUuid     uuid not null references hs_office_bankaccount(uuid),
-    reference           varchar(96),
+    reference           varchar(96) not null,
     validity            daterange not null
 );
 --//
diff --git a/src/main/resources/db/changelog/253-hs-office-sepamandate-rbac.sql b/src/main/resources/db/changelog/253-hs-office-sepamandate-rbac.sql
index 56bbff58..85569e6e 100644
--- a/src/main/resources/db/changelog/253-hs-office-sepamandate-rbac.sql
+++ b/src/main/resources/db/changelog/253-hs-office-sepamandate-rbac.sql
@@ -1,21 +1,21 @@
 --liquibase formatted sql
 
 -- ============================================================================
---changeset hs-office-sepaMandate-rbac-OBJECT:1 endDelimiter:--//
+--changeset hs-office-sepamandate-rbac-OBJECT:1 endDelimiter:--//
 -- ----------------------------------------------------------------------------
-call generateRelatedRbacObject('hs_office_sepaMandate');
+call generateRelatedRbacObject('hs_office_sepamandate');
 --//
 
 
 -- ============================================================================
---changeset hs-office-sepaMandate-rbac-ROLE-DESCRIPTORS:1 endDelimiter:--//
+--changeset hs-office-sepamandate-rbac-ROLE-DESCRIPTORS:1 endDelimiter:--//
 -- ----------------------------------------------------------------------------
-call generateRbacRoleDescriptors('hsOfficeSepaMandate', 'hs_office_sepaMandate');
+call generateRbacRoleDescriptors('hsOfficeSepaMandate', 'hs_office_sepamandate');
 --//
 
 
 -- ============================================================================
---changeset hs-office-sepaMandate-rbac-ROLES-CREATION:1 endDelimiter:--//
+--changeset hs-office-sepamandate-rbac-ROLES-CREATION:1 endDelimiter:--//
 -- ----------------------------------------------------------------------------
 
 /*
@@ -36,10 +36,8 @@ begin
 
     if TG_OP = 'INSERT' then
 
-
         -- === ATTENTION: code generated from related Mermaid flowchart: ===
 
-
         perform createRoleWithGrants(
                 hsOfficeSepaMandateOwner(NEW),
                 permissions => array['*'],
@@ -73,7 +71,6 @@ begin
 
         -- === END of code generated from Mermaid flowchart. ===
 
-
     else
         raise exception 'invalid usage of TRIGGER';
     end if;
@@ -86,23 +83,23 @@ end; $$;
  */
 create trigger createRbacRolesForHsOfficeSepaMandate_Trigger
     after insert
-    on hs_office_sepaMandate
+    on hs_office_sepamandate
     for each row
 execute procedure hsOfficeSepaMandateRbacRolesTrigger();
 --//
 
 
 -- ============================================================================
---changeset hs-office-sepaMandate-rbac-IDENTITY-VIEW:1 endDelimiter:--//
+--changeset hs-office-sepamandate-rbac-IDENTITY-VIEW:1 endDelimiter:--//
 -- ----------------------------------------------------------------------------
-call generateRbacIdentityView('hs_office_sepaMandate', idNameExpression => 'target.reference');
+call generateRbacIdentityView('hs_office_sepamandate', idNameExpression => 'target.reference');
 --//
 
 
 -- ============================================================================
---changeset hs-office-sepaMandate-rbac-RESTRICTED-VIEW:1 endDelimiter:--//
+--changeset hs-office-sepamandate-rbac-RESTRICTED-VIEW:1 endDelimiter:--//
 -- ----------------------------------------------------------------------------
-call generateRbacRestrictedView('hs_office_sepaMandate',
+call generateRbacRestrictedView('hs_office_sepamandate',
     orderby => 'target.reference',
     columnUpdates => $updates$
         validity = new.validity
@@ -111,7 +108,7 @@ call generateRbacRestrictedView('hs_office_sepaMandate',
 
 
 -- ============================================================================
---changeset hs-office-sepaMandate-rbac-NEW-SepaMandate:1 endDelimiter:--//
+--changeset hs-office-sepamandate-rbac-NEW-SepaMandate:1 endDelimiter:--//
 -- ----------------------------------------------------------------------------
 /*
     Creates a global permission for new-sepaMandate and assigns it to the hostsharing admins role.
@@ -146,9 +143,9 @@ end; $$;
 /**
     Checks if the user or assumed roles are allowed to create a new customer.
  */
-create trigger hs_office_sepaMandate_insert_trigger
+create trigger hs_office_sepamandate_insert_trigger
     before insert
-    on hs_office_sepaMandate
+    on hs_office_sepamandate
     for each row
     -- TODO.spec: who is allowed to create new sepaMandates
     when ( not hasAssumedRole() )
diff --git a/src/main/resources/db/changelog/258-hs-office-sepamandate-test-data.sql b/src/main/resources/db/changelog/258-hs-office-sepamandate-test-data.sql
index 7af102a4..d96bfcb5 100644
--- a/src/main/resources/db/changelog/258-hs-office-sepamandate-test-data.sql
+++ b/src/main/resources/db/changelog/258-hs-office-sepamandate-test-data.sql
@@ -31,7 +31,7 @@ begin
     raise notice '- using debitor (%): %', relatedDebitor.uuid, relatedDebitor;
     raise notice '- using bankAccount (%): %', relatedBankAccount.uuid, relatedBankAccount;
     insert
-        into hs_office_sepaMandate (uuid, debitoruuid, bankAccountuuid, reference, validity)
+        into hs_office_sepamandate (uuid, debitoruuid, bankAccountuuid, reference, validity)
         values (uuid_generate_v4(), relatedDebitor.uuid, relatedBankAccount.uuid, 'ref'||idName, daterange('20221001' , '20261231', '[]'));
 end; $$;
 --//
diff --git a/src/test/java/net/hostsharing/hsadminng/arch/ArchitectureTest.java b/src/test/java/net/hostsharing/hsadminng/arch/ArchitectureTest.java
index b32c41a9..2563ee17 100644
--- a/src/test/java/net/hostsharing/hsadminng/arch/ArchitectureTest.java
+++ b/src/test/java/net/hostsharing/hsadminng/arch/ArchitectureTest.java
@@ -77,7 +77,7 @@ public class ArchitectureTest {
     public static final ArchRule HsOfficeBankAccountPackageRule = classes()
             .that().resideInAPackage("..hs.office.bankaccount..")
             .should().onlyBeAccessed().byClassesThat()
-            .resideInAnyPackage("..hs.office.bankaccount..", "..hs.office.debitor..");
+            .resideInAnyPackage("..hs.office.bankaccount..", "..hs.office.sepamandate..", "..hs.office.debitor..");
 
     @ArchTest
     @SuppressWarnings("unused")
@@ -86,7 +86,6 @@ public class ArchitectureTest {
             .should().onlyBeAccessed().byClassesThat()
             .resideInAnyPackage("..hs.office.partner..", "..hs.office.debitor..");
 
-
     @ArchTest
     @SuppressWarnings("unused")
     public static final ArchRule acceptsAnnotationOnMethodsRule = methods()
diff --git a/src/test/java/net/hostsharing/hsadminng/hs/office/partner/TestHsOfficePartner.java b/src/test/java/net/hostsharing/hsadminng/hs/office/partner/TestHsOfficePartner.java
index 386e3a1c..96f5a5d4 100644
--- a/src/test/java/net/hostsharing/hsadminng/hs/office/partner/TestHsOfficePartner.java
+++ b/src/test/java/net/hostsharing/hsadminng/hs/office/partner/TestHsOfficePartner.java
@@ -9,7 +9,7 @@ import static net.hostsharing.hsadminng.hs.office.person.HsOfficePersonType.LEGA
 
 public class TestHsOfficePartner {
 
-    public static final HsOfficePartnerEntity testLtd = HsOfficePartnerWithLegalPerson("Test Ltd.");
+    public static final HsOfficePartnerEntity testPartner = HsOfficePartnerWithLegalPerson("Test Ltd.");
 
     static public HsOfficePartnerEntity HsOfficePartnerWithLegalPerson(final String tradeName) {
         return HsOfficePartnerEntity.builder()
diff --git a/src/test/resources/application.yml b/src/test/resources/application.yml
index c6e28a1a..a80fa23a 100644
--- a/src/test/resources/application.yml
+++ b/src/test/resources/application.yml
@@ -30,6 +30,7 @@ spring:
 logging:
     level:
         liquibase: INFO
-        org.hibernate.SQL: DEBUG
-        org.hibernate.type.descriptor.sql.BasicBinder: TRACE
+        X.org.hibernate.SQL: DEBUG
+        X.org.hibernate.type.descriptor.sql.BasicBinder: TRACE
         X.org.springframework.jdbc.core: TRACE
+        net.ttddyy.dsproxy.listener: debug