Duplicate Inherited memberships caused by updating relationship via api in a post hook

If a individual contact inherits a membership via relationship such as 'Employee/Employer' and you try to update the relationship in a post-hook a duplicate membership is created. That is the individual will receive 2 inherited memberships instead of one.

The site I am developing on is 4.3.3 but I would assume that this happens in other versions.

Explained in detail in forum topic: http://forum.civicrm.org/index.php/topic,29822.new.html#new

Example of post hook code:
function mymodule_civicrm_post( $op, $objectName, $objectId, &$objectRef ){
if($op=='create'){
if ($objectName=='Relationship')

{ $params = array( 'version' => 3, 'sequential' => 1, 'id' => $objectId, 'contact_id_a' => $objectRef->contact_id_a, 'contact_id_b' => $objectRef->contact_id_b, 'is_permission_a_b' => 1, ); $result = civicrm_api('Relationship', 'create', $params); }

}

}