Readonly Dependency Half Working

Hi everyone.

I am having an issue where I have created a readonly dependncy but it's only working on some of the fields but not all, has anyone had this? My dependency file lives here: custom/Extension/modules/Contacts/Ext/Dependencies/pp_readonly.php

In the snipper below, pp_id_c is not readonly but pp_api_result_c is, and in the second lot of fields, everything above the "not working" works.

Does anyone have any ideas as it's baffling me? I've checked the right names and tried it without an array and it just doesn't work.

Thanks!

Daniel

<?php
$readonly_fields = array(
	'pp_api_result_c',
	'pp_id_c'
);

foreach($readonly_fields as $field)
{
	$dependencies['Contacts']['readonly_fields_always_'.$field] = array(
		'hooks' => array("edit","all"),
		'trigger' => 'true',
		'onload' => true,
		'actions' => array(
			array(
				'name' => 'ReadOnly',
				//The parameters passed in will depend on the action type set in 'name'
				'params' => array(
					'target' => $field,
					'value' => 'true',
				),
			),
		),
	);
}

$readonly_fields = array(
	'salutation',
	'first_name',
	'last_name',
	'primary_address_street',
	'primary_address_city',
	'primary_address_state',
	'primary_address_postalcode',
	'primary_address_country',
	'phone_work',
	'phone_mobile',
	'email',
	//Not working
	'pp_type_c',
	'pp_branch_c',
	'pp_branch_area_c',
	'pp_start_date_c',
	'pp_service_priority_c'
);

foreach($readonly_fields as $field)
{
	$dependencies['Contacts']['readonly_fields_ppid_'.$field] = array(
		'hooks' => array("edit","all"),
		'trigger' => 'true',
		'onload' => true,
		'actions' => array(
			array(
				'name' => 'ReadOnly',
				//The parameters passed in will depend on the action type set in 'name'
				'params' => array(
					'target' => $field,
					'value' => 'greaterThan(strlen($pp_id_c),0)',
				),
			),
		),
	);
}