InfoPath Dev

I have a xml structure like this:

<my:myFields>
    <my:Settings>
		<my:MR_Group>
			<my:MR_ID>
				<my:MR_Namespace>nsp1</my:MR_Namespace>
				<my:MR_Name>name1</my:MR_Name>
			</my:MR_ID>	
			<my:MR_ID>
				<my:MR_Namespace>nsp2</my:MR_Namespace>
				<my:MR_Name>name2</my:MR_Name>
			</my:MR_ID>	
			<my:MR_ID>
				<my:MR_Namespace>nsp3</my:MR_Namespace>
				<my:MR_Name>name3</my:MR_Name>
			</my:MR_ID>			
		</my:MR_Group>		
    </my:Settings>

    <my:Context>
	    <my:ContextLevel>
		    <my:ContextField>NameSpace</my:ContextField>
		    <my:MatchValue></my:MatchValue>
	    </my:ContextLevel>
	    <my:ContextLevel>
		    <my:ContextField>Name</my:ContextField>
		    <my:MatchValue></my:MatchValue>
	    </my:ContextLevel>
    </my:Context>
</my:myFields>

ContextLevel is a repeating section. There are two default Values if I add a new ContextLevel element.
The first default value in ContextField[1] ist NameSpace. The appendant MatchValue[1] should be a
link to the datasource MR_Namespace in the template and it has to be a dropdown list with
all MR_Namespace datas.

And the second default value in ContextField[2] ist Name. This appendant MatchValue[2] should be a
link to the datasource MR_Name in the template but not the first default value of MatchValue.
It is also a dropdown list with all MR_Name datas.

At the moment my solution is that I can link all namespaces OR all names to both MatchValue tags
but not namespaces in MatchValue[1] and names in MatchValue[2].

I hope you will understand my problem and anybody can help me.