FetchXML with Web API Fails When Using Multiple link-entity Elements

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Posted on by CU26111754-0

I am using FetchXML queries with the Web API in Power Pages to retrieve data with multiple link-entity elements. According to the documentation, FetchXML supports up to 10 link-entity elements. However, when I include more than 1 link-entity in my FetchXML query, I receive a "Web API is not available" or similar error. The query works fine with a single link-entity, but adding more causes it to fail.

var fetchXml = `<fetch count="10" page="1" returntotalrecordcount="true">
  <entity name="primary_entity">
    <attribute name="recordid" />
    <link-entity name="related_entity_1" from="id" to="related_id_1" alias="alias1" link-type="outer">
      <attribute name="field1" />
    </link-entity>
    <link-entity name="related_entity_2" from="id" to="related_id_2" alias="alias2" link-type="outer">
      <attribute name="field2" />
    </link-entity>
  </entity>
</fetch>`;
$.ajax({
    type: "GET",
    url: "/_api/primary_entities?fetchXml=" + encodeURIComponent(fetchXml),
    success: function (res) {
        console.log(res);
    },
    error: function (xhr) {
        console.error(xhr.responseText);
    }
});

Here it works for when use one link-entity but for two it states web api is not available.

Is there a specific limitation when using multiple link-entity elements in FetchXML through the Web API?

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bscarlavai33 752 Super User 2026 Season 1 on at

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That should be fine. Maybe there is some sort of syntax issue.

Are you able to run your Fetch XML using XrmToolBox and see if it returns a result? https://www.xrmtoolbox.com/plugins/Cinteros.Xrm.FetchXmlBuilder/

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CU26111754-0 30 on at

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I have created the xml using fetchxmlbuilder. From this fetch if i remove one entity then its work fine.

Also the error “Web Api is not available” i encountered come when site settings is not available but in this i have ensure that they are created.

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Fubar 8,463 Super User 2026 Season 1 on at

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Not sure if this is the issue or not, but there is a known issue with complex queries when the system adds the extra pieces for the Table Permissions (i.e. it adjusts your query to add the permissions scope like account and contact scope).

https://learn.microsoft.com/en-us/power-pages/configure/web-api-overview#known-issues

You can test this by setting table permissions to Global as global does not alter the query.

My other thought would be that it may not like it as they are both Outer joins - but if thats the case may be more of a bug..

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