diff --git a/test_data/schema/taxonomy/v6.6/de-gcd-2022-05-02/de-gcd-2022-05-02.xsd b/test_data/schema/taxonomy/v6.6/de-gcd-2022-05-02/de-gcd-2022-05-02.xsd
index d53c12f..18a357c 100644
--- a/test_data/schema/taxonomy/v6.6/de-gcd-2022-05-02/de-gcd-2022-05-02.xsd
+++ b/test_data/schema/taxonomy/v6.6/de-gcd-2022-05-02/de-gcd-2022-05-02.xsd
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--(c) XBRL Deutschland e.V. - see http://www.xbrl.de-->
-
+<!-- MODIFIED VERSION -->
 
 <xs:schema xmlns:de-gcd="http://www.xbrl.de/taxonomies/de-gcd-2022-05-02"
            xmlns:de-hgbrole="http://www.xbrl.de/taxonomies/hgbrole-2022-05-02"
@@ -48,8 +48,10 @@
    </xs:annotation>
    <xs:import namespace="http://www.xbrl.de/taxonomies/hgbrole-2022-05-02"
               schemaLocation="hgbrole-2022-05-02.xsd"/>
+   <!-- MODFIED -->
    <xs:import namespace="http://www.xbrl.org/2003/instance"
-              schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
+   schemaLocation="../../../xbrl-instance-2003-12-31.xsd"/>
+   <!-- MODFIED -->
    <xs:element name="genInfo" abstract="true" id="de-gcd_genInfo" nillable="true"
                substitutionGroup="xbrli:item"
                type="xbrli:stringItemType"
diff --git a/test_data/schema/xbrl-instance-2003-12-31.xsd b/test_data/schema/xbrl-instance-2003-12-31.xsd
index 09d32b6..04dc79e 100644
--- a/test_data/schema/xbrl-instance-2003-12-31.xsd
+++ b/test_data/schema/xbrl-instance-2003-12-31.xsd
@@ -28,6 +28,7 @@ http://www.xbrl.org/2003/2008-07-02/xbrl-instance-2003-12-31.xsd
   </annotation>
 
   <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="xbrl-linkbase-2003-12-31.xsd"/>
+  <import namespace="http://www.xbrl.de/taxonomies/de-gcd-2022-05-02/shell" schemaLocation="./taxonomy/v6.6/de-gcd-2022-05-02/de-gcd-2022-05-02-shell.xsd"/>
 
   <annotation>
     <documentation>