Survey Force for SFDC - Unable to populate custom lookup field on SurveyTaker__c

Hi everyone,

I'm customizing Survey Force and need to populate a custom lookup field (Vehicle__c) on the SurveyTaker__c object from a survey URL parameter.

What I have done

1.  Created a custom lookup field: 
   •  Object: SurveyTaker__c
   •  Field API Name: Vehicle__c
   •  Lookup to a custom Vehicle object 
2.  Passed the Vehicle Id in the survey URL: 

/apex/takesurvey?id=<SurveyId>&cId=<ContactId>&caId=none&vId=<VehicleId>#Salesforce Surveys