Reference Schema loader for Transaction Input Property

Question

Hello,
I am trying to use XML Schema to define input structure of a BLS transaction, I have two issues with it.
Firstly. I do not get drill down Tree structure of the XML input parameter in an action block's link editor,
Secondly, If I add a reference document drill down comes, but there is an issue with that, when I close and open the transaction I get this error
I am not sure What I am missing here. Has anyone come across this issue?
Can we assign a reference schema document to an Incomming Parameter?
I have configured the transaction as given below.
1. I have specified an input parameter as XML type and linked it to a XSD file
2. The XSD File
<s:schema attributeFormDefault="unqualified" elementFormDefault="qualified"
  xmlns:s="http://www.w3.org/2001/XMLSchema"
            targetNamespace="http://www.sap.com/xMII">
  <s:element name="Request">
    <s:complexType>
      <s:sequence>
        <s:element type="s:string" name="MaterialNumber"/>
        <s:element type="s:string" name="Plant"/>
        <s:element name="TestList" minOccurs="1" maxOccurs="unbounded">
          <s:complexType>
            <s:sequence>
              <s:element type="s:string" name="Param"/>
            </s:sequence>
          </s:complexType>
        </s:element>
      </s:sequence>
    </s:complexType>
  </s:element>
</s:schema>
3. Created a reference Schema loader Action and configured it to refer the same XSD as above.
4. Assigned the Reference schema loader's XMLcontent to "Input"  property of transaction.

Answer 1

Hello Sam,
Thank you for the reply,
unfortunately, It still does'nt work for me.
I have 14.0 SP4 Patch 1 (08.01.2014).
Do you think an upgrade will help?
Also, why does below popup come when I close and open the transaction.