You don't need to add i:type=\"a:RetrieveRequest\" part to request. Please find below a function that I have used to call actions in the past.
function ActionCall(ActionName, Guid, EntityLogicalName) {
var requestXML = ""
requestXML += "<s:Envelope xmlns:s=\"schemas.xmlsoap.org/.../envelope\">";
requestXML += " <s:Body>";
requestXML += " <Execute xmlns=\"schemas.microsoft.com/.../Services\" xmlns:i=\"www.w3.org/.../XMLSchema-instance\">";
requestXML += " <request xmlns:a=\"schemas.microsoft.com/.../Contracts\">";
requestXML += " <a:Parameters xmlns:b=\"schemas.datacontract.org/.../System.Collections.Generic\">";
requestXML += " <a:KeyValuePairOfstringanyType>";
requestXML += " <b:key>Target</b:key>";
requestXML += " <b:value i:type=\"a:EntityReference\">";
requestXML += " <a:Id>" + Guid + "</a:Id>";
requestXML += " <a:LogicalName>" + EntityLogicalName + "</a:LogicalName>";
requestXML += " <a:Name i:nil=\"true\" />";
requestXML += " </b:value>";
requestXML += " </a:KeyValuePairOfstringanyType>";
requestXML += " </a:Parameters>";
requestXML += " <a:RequestId i:nil=\"true\" />";
requestXML += " <a:RequestName>" + ActionName + "</a:RequestName>";
requestXML += " </request>";
requestXML += " </Execute>";
requestXML += " </s:Body>";
requestXML += "</s:Envelope>";
// Using Jquery. Asynch
$.ajax(
{
type: "POST",
contentType: "text/xml;charset=utf-8",
datatype: "xml",
url: Xrm.Page.context.getClientUrl() + "/XRMServices/2011/Organization.svc/web",
data: requestXML,
beforeSend: function (XMLHttpRequest) {
XMLHttpRequest.setRequestHeader("Accept", "application/xml, text/xml, */*");
XMLHttpRequest.setRequestHeader("SOAPAction", "schemas.microsoft.com/.../Execute");
XMLHttpRequest.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
XMLHttpRequest.setRequestHeader("Content-Length", requestXML.length);
},
success: function (data, textStatus, XmlHttpRequest) {
console.log("Action call completed. ....");
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
console.log("Unable to call action....");
}
});
// or use XMLHttpRequest directly.
/*
var req = new XMLHttpRequest();
req.open("POST", Xrm.Page.context.getClientUrl() + "/XRMServices/2011/Organization.svc/web", false)
req.setRequestHeader("Accept", "application/xml, text/xml, */*");
req.setRequestHeader("Content-Type", "text/xml; charset=utf-8");
req.setRequestHeader("Content-Length", requestXML.length);
req.setRequestHeader("SOAPAction", "schemas.microsoft.com/.../Execute");
req.send(requestXML);
*/
}
And to call the above function:
ActionCall("bdf_AppelPluginDevis", Xrm.Page.data.entity.getId(), Xrm.Page.data.entity.getEntityName());
