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Trying to build master-detail page: Master is list (XML) from one source (http:...) and Detail is just table from second source http:.../123 where last number comes from first source (like some sort of ID). Clicking on one label in list must renew small detail table.

In case if I have in list only one item, it works. If I have more (eg 32 rows), then I get error:

Wrong occurrence to match required sequence type
Details
XPTY0004: The supplied sequence ('32' item(s)) has the wrong occurrence to match the sequence type xs:anyAtomicType ('zero or one')

On list I have "repeating table" (tried also "repeating rows") and label with action:
Load from HTTP: $XML2 (XML)
Source: concat($PERSISTENT/Root/ServiceRootURL, $XML1/root/row/@id)

I also have one label in list having same expression (for testing porpuses) and it shows correct/different data on every row.

If I change action source as follows:
Source: concat($PERSISTENT/Root/ServiceRootURL, $XML1/root/row[1]/@id)
then XML2 got refreshed and its content corresponds to first row ([1]).

I think that repeating table/row should do trick for me but it doesn't. Since it doesn't my question is how to point on action script to "current" rows data (instead of constant [1])?

In case I put into repeating table the *label* with XPath expression there are in in builder view fulfilled (below left) context ($XML1/root/row). And it works so (actually desinger/builder is smart enough to use relative path ("Absolute XPath" is unchecked and doubleclick adds short relative expression)).

But for "Load from HTTP" Source [...] -- opens same expression Builder but there are written "<no context available>" and "Absolute XPath" checkbox is checked and disabled.
So, how to say that really I have context?


Source code is

<PageXMLRootXML id="55" name="XML1" readOnlyXML="1" loadBeforePageOpen="never" hasUrl="1">
<children>
<PageXMLElement id="56" name="root" from="xml">
<children>
<PageXMLElement id="57" name="row" from="xml">
<children>
<PageXMLAttribute id="58" name="id" from="xml"/>
<PageXMLAttribute id="59" name="tekst" from="xml"/>
.....
And
<DesignTable id="12" pageXML="57">
<style addDelPossible="0" repeating="1"/>
....
there are 2 things inside this repeating table
<DesignLabel id="20" pageXML="59">
<style name="Label4"/>
<controlActions id="39">
<children>
<DesignActionLoadFromHttp id="181" xmlRootRef="185">
<HttpSettings so="1" id="182" url_so="concat($PERSISTENT/Root/JuurURL, @id)" urlIsXPath_so="1" returnsNewXML_so="1"/>
....
and
<DesignLabel id="173">
<style name="Label13" text_x="concat( $PERSISTENT/Root/JuurURL, @id)"/>

Latter is fine, first one behaves wrongly:

Load from HTTP '$XML2'
Executed on server: HTTP: URL has an invalid XPath 'concat($PERSISTENT/Root/JuurURL, @id)'
Context item is undefined
Details
XPDY0002: Cannot evaluate expression '@id', because the context item is undefined

How to force builder to use context?

Workaround works. Thanks.