Tomado de Aquí.

Step 1

Go on the form where the lookup is displayed:

On the onload event, add this line of code and change LookupSchemaName by the schema name of your lookup.

crmForm.all.LookupSchemaName.FireOnChange();

Step 2

On the onchange event of the lookup, Copy the following code (inside the table):

  • fieldToDisplay = the name of the attribute that you want to display in the lookup. Take the schema name of the attribute in the linked entity.
  • fieldToDisplayIsText:
    • true if you want to display a nvarchar field.
    • false if you want to display a picklist or a lookup field.
  • organizationName = name of your organization (without spaces).

var fieldToDisplay = ‘accountnumber’;
var fieldToDisplayIsText = true;
var organizationName = ‘MyOrganizationName’;

var lookupData = new Array();
var lookupItem= new Object();
var lookup = event.srcElement.DataValue;

if (typeof(lookup) != ‘undefined’ && lookup != null && lookup[0] != null)
{
var myValue = GetAttributeValueFromID(lookup[0].typename,lookup[0].id,fieldToDisplay,fieldToDisplayIsText);

if(myValue != ”)
{

  lookupItem.id = lookup[0].id;
   lookupItem.typename = lookup[0].typename;
   lookupItem.name = myValue;
   lookupData[0] = lookupItem; 
   crmForm.all[event.srcElement.id].DataValue = lookupData;
}

}

function GetAttributeValueFromID(sEntityName, sGUID, sAttributeName, isTextField)
{
var xml = "" +

"<?xml version="1.0" encoding="utf-8"?>" +

"<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">" +

"  <soap:Header>" +

"    <CrmAuthenticationToken xmlns="http://schemas.microsoft.com/crm/2007/WebServices">" +

"      <AuthenticationType xmlns="http://schemas.microsoft.com/crm/2007/CoreTypes">0</AuthenticationType>" +

"      <OrganizationName xmlns="http://schemas.microsoft.com/crm/2007/CoreTypes">"+organizationName +"</OrganizationName>" +

"      <CallerId xmlns="http://schemas.microsoft.com/crm/2007/CoreTypes">00000000-0000-0000-0000-000000000000</CallerId>" +

"    </CrmAuthenticationToken>" +

"  </soap:Header>" +

"  <soap:Body>" +

"    <Execute xmlns="http://schemas.microsoft.com/crm/2007/WebServices">" +

"      <Request xsi:type="RetrieveRequest" ReturnDynamicEntities="false">" +

"        <Target xsi:type="TargetRetrieveDynamic">" +

"          <EntityName>" + sEntityName + "</EntityName>" +

"          <EntityId>" + sGUID + "</EntityId>" +

"        </Target>" +

"        <ColumnSet xmlns:q1="http://schemas.microsoft.com/crm/2006/Query" xsi:type="q1:ColumnSet">" +

"          <q1:Attributes>" +

"            <q1:Attribute>" + sAttributeName + "</q1:Attribute>" +

"          </q1:Attributes>" +

"        </ColumnSet>" +

"      </Request>" +

"    </Execute>" +

"  </soap:Body>" +

"</soap:Envelope>" +

"";

var xmlHttpRequest = new ActiveXObject("Msxml2.XMLHTTP");

xmlHttpRequest.Open("POST", "/mscrmservices/2007/CrmService.asmx", false);

xmlHttpRequest.setRequestHeader("SOAPAction","http://schemas.microsoft.com/crm/2007/WebServices/Execute");

xmlHttpRequest.setRequestHeader("Content-Type", "text/xml; charset=utf-8");

xmlHttpRequest.setRequestHeader("Content-Length", xml.length);

xmlHttpRequest.send(xml);

var result = null;

if(isTextField){

result = xmlHttpRequest.responseXML.selectSingleNode("//q1:" + sAttributeName).text;

}

else

{

result = xmlHttpRequest.responseXML.selectSingleNode("//q1:" + sAttributeName).getAttribute(‘name’);

}
                        if (result == null)
                        {
                                    return ”;
}
                        else
                        return result;
            }

Step 3

Save and publish the entity

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