diff --git a/Interfaces/GSD/Model/GSDAddressMapper.php b/Interfaces/GSD/Model/GSDAddressMapper.php
index 7a9dcbf..24cbb6a 100644
--- a/Interfaces/GSD/Model/GSDAddressMapper.php
+++ b/Interfaces/GSD/Model/GSDAddressMapper.php
@@ -35,7 +35,7 @@ final class GSDAddressMapper extends DataMapperAbstract
     protected static array $columns = [
         'AdressRowId'     => ['name' => 'AdressRowId',     'type' => 'int',      'internal' => 'id'],
         'row_create_time' => ['name' => 'row_create_time', 'type' => 'DateTime', 'internal' => 'createdAt', 'readonly' => true],
-        'row_create_user' => ['name' => 'row_create_user', 'type' => 'int',      'internal' => 'createdBy'],
+        'row_create_user' => ['name' => 'row_create_user', 'type' => 'int',      'internal' => 'createdBy', 'readonly' => true],
         'NAME1'           => ['name' => 'NAME1',           'type' => 'string',   'internal' => 'name1'],
         'NAME2'           => ['name' => 'NAME2',           'type' => 'string',   'internal' => 'name2'],
         'NAME3'           => ['name' => 'NAME3',           'type' => 'string',   'internal' => 'name3'],
diff --git a/Interfaces/GSD/Model/GSDArticleMapper.php b/Interfaces/GSD/Model/GSDArticleMapper.php
index 9b64b17..1fac554 100644
--- a/Interfaces/GSD/Model/GSDArticleMapper.php
+++ b/Interfaces/GSD/Model/GSDArticleMapper.php
@@ -35,7 +35,7 @@ final class GSDArticleMapper extends DataMapperAbstract
     protected static array $columns = [
         'row_id'               => ['name' => 'row_id',               'type' => 'int',      'internal' => 'id'],
         'row_create_time'      => ['name' => 'row_create_time',      'type' => 'DateTime', 'internal' => 'createdAt', 'readonly' => true],
-        'row_create_user'      => ['name' => 'row_create_user',      'type' => 'int',      'internal' => 'createdBy'],
+        'row_create_user'      => ['name' => 'row_create_user',      'type' => 'int',      'internal' => 'createdBy', 'readonly' => true],
         'Artikelnummer'        => ['name' => 'Artikelnummer',        'type' => 'string',   'internal' => 'number'],
         'Artikelbezeichnung'   => ['name' => 'Artikelbezeichnung',   'type' => 'string',   'internal' => 'name1'],
         '_Artikelbezeichnung2' => ['name' => '_Artikelbezeichnung2', 'type' => 'string',   'internal' => 'name2'],
diff --git a/Interfaces/GSD/Model/GSDCostCenterMapper.php b/Interfaces/GSD/Model/GSDCostCenterMapper.php
index 80675b0..d8004db 100644
--- a/Interfaces/GSD/Model/GSDCostCenterMapper.php
+++ b/Interfaces/GSD/Model/GSDCostCenterMapper.php
@@ -35,7 +35,7 @@ final class GSDCostCenterMapper extends DataMapperAbstract
     protected static array $columns = [
         'ROW_ID'          => ['name' => 'ROW_ID',          'type' => 'int',      'internal' => 'id'],
         'row_create_time' => ['name' => 'row_create_time', 'type' => 'DateTime', 'internal' => 'createdAt', 'readonly' => true],
-        'row_create_user' => ['name' => 'row_create_user', 'type' => 'int',      'internal' => 'createdBy'],
+        'row_create_user' => ['name' => 'row_create_user', 'type' => 'int',      'internal' => 'createdBy', 'readonly' => true],
         'KST'             => ['name' => 'KST',             'type' => 'string',   'internal' => 'costcenter'],
         'Bezeichnung'     => ['name' => 'Bezeichnung',     'type' => 'string',   'internal' => 'description'],
     ];
diff --git a/Interfaces/GSD/Model/GSDCostObjectMapper.php b/Interfaces/GSD/Model/GSDCostObjectMapper.php
index 932e5b5..6ebfcfa 100644
--- a/Interfaces/GSD/Model/GSDCostObjectMapper.php
+++ b/Interfaces/GSD/Model/GSDCostObjectMapper.php
@@ -35,7 +35,7 @@ final class GSDCostObjectMapper extends DataMapperAbstract
     protected static array $columns = [
         'ROW_ID'          => ['name' => 'ROW_ID',          'type' => 'int',      'internal' => 'id'],
         'row_create_time' => ['name' => 'row_create_time', 'type' => 'DateTime', 'internal' => 'createdAt', 'readonly' => true],
-        'row_create_user' => ['name' => 'row_create_user', 'type' => 'int',      'internal' => 'createdBy'],
+        'row_create_user' => ['name' => 'row_create_user', 'type' => 'int',      'internal' => 'createdBy', 'readonly' => true],
         'KTR'             => ['name' => 'KTR',             'type' => 'string',   'internal' => 'costobject'],
         'Bezeichnung'     => ['name' => 'Bezeichnung',     'type' => 'string',   'internal' => 'description'],
     ];
diff --git a/Interfaces/GSD/Model/GSDCustomerMapper.php b/Interfaces/GSD/Model/GSDCustomerMapper.php
index 39e1a39..dca31f0 100644
--- a/Interfaces/GSD/Model/GSDCustomerMapper.php
+++ b/Interfaces/GSD/Model/GSDCustomerMapper.php
@@ -35,7 +35,7 @@ final class GSDCustomerMapper extends DataMapperAbstract
     protected static array $columns = [
         'row_id'               => ['name' => 'row_id',          'type' => 'int',      'internal' => 'id'],
         'row_create_time'      => ['name' => 'row_create_time', 'type' => 'DateTime', 'internal' => 'createdAt', 'readonly' => true],
-        'row_create_user'      => ['name' => 'row_create_user', 'type' => 'int',      'internal' => 'createdBy'],
+        'row_create_user'      => ['name' => 'row_create_user', 'type' => 'int',      'internal' => 'createdBy', 'readonly' => true],
         'Kundennummer'         => ['name' => 'Kundennummer',    'type' => 'string',   'internal' => 'number'],
     ];