Salesforce PHP SOAP API。如何填充查阅字段？

Question

我有一个名为“Chapter_Detail__c”的自定义对象。我正在创建一个LEAD，并且一个带有一个查找字段（link_id__c），它与“Chapter_Detail__c”映射。

如何在创建潜在客户时填充此查找字段。

$sObject = new SObject();
$fieldsToInsert = array (
  'FirstName' => $name_rsform,
  'LastName' => $username_rsform,
  'Company' => 'TestSession',
  'Full_Name__c' => $name_rsform,
  'Chapter_Name__c' => $chapter_name_rsform,
  'Role__c' => $role_rsform_label,
  'Email__c' => $email_rsform,
  'Branch_of_service__c' => $bos_f,

    // 'link_id__c' => $chapter_id_rsform, - DOES NOT WORK THIS WAY ITS A LOOKUP RELATIONSHIP WITH OBJECT "Chapter_Detail__c"
  );
 $sObject->fields = $fieldsToInsert;
 $sObject->type = 'Lead';
    //echo "**** Creating the following:\r\n";
 $createResponse = $mySforceConnection->create(array($sObject));
    //print_r($createResponse);

 echo 'Get ID after create';
$ids = array();
foreach ($createResponse as $createResult) {
    print_r($createResult);
    array_push($ids, $createResult->id);
}

$idRecieved = $ids[0];

任何形式的帮助将不胜感激。感谢。