diff --git a/wst/trunk/tests/test_suite/files/write_header_simple_content_2.xml b/wst/trunk/tests/test_suite/files/write_header_simple_content_2.xml
index cbb6a94e5..8929046a4 100644
--- a/wst/trunk/tests/test_suite/files/write_header_simple_content_2.xml
+++ b/wst/trunk/tests/test_suite/files/write_header_simple_content_2.xml
@@ -6,7 +6,7 @@
   xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
   <SOAP-ENV:Header xmlns:ns1="urn:simple-content-header.sample">
     <ns1:TSampleSimpleContentHeaderBlock_A>sample header simple content value</ns1:TSampleSimpleContentHeaderBlock_A>
-    <ns1:TSampleSimpleContentHeaderBlock_B intAtt="1210">another content</ns1:TSampleSimpleContentHeaderBlock_B>
+    <ns1:TSampleSimpleContentHeaderBlock_B intAtt="1210" SOAP-ENV:mustUnderstand="1">another content</ns1:TSampleSimpleContentHeaderBlock_B>
   </SOAP-ENV:Header>
   <SOAP-ENV:Body>
     <ns2:test_proc xmlns:ns2="TestService"/>
diff --git a/wst/trunk/tests/test_suite/test_soap_specific.pas b/wst/trunk/tests/test_suite/test_soap_specific.pas
index 31dc91696..623f8c86c 100644
--- a/wst/trunk/tests/test_suite/test_soap_specific.pas
+++ b/wst/trunk/tests/test_suite/test_soap_specific.pas
@@ -579,6 +579,7 @@ begin
   hdrB := TSampleSimpleContentHeaderBlock_B.Create();
   cc.AddHeader(hdrB,True);
   hdrB.Direction := hdOut;
+  hdrB.mustUnderstand := 1;
   hdrB.Value := 'another content';
   hdrB.intAtt := 1210;