Standardisation work, changed accnum() to refnum()

modules/charge/classes/Model/Charge.php

@@ -15,9 +15,6 @@ class Model_Charge extends ORM_OSB implements Invoicable {
 		'product'=>array(),
 		'service'=>array(),
 	);
-	protected $_has_one = array(
-		'invoice_item'=>array('far_key'=>'id'),
-	);
 
 	protected $_compress_column = array(
 		'attributes',
@@ -82,6 +79,20 @@ class Model_Charge extends ORM_OSB implements Invoicable {
 		}
 	}
 
+	/**
+	 * Return the Invoice Item object for this charge
+	 */
+	public function iio() {
+		$iio = ORM::factory('Invoice_Item');
+		if ($this->processed) {
+			$iio->where('module_id','=',$this->mid())
+				->where('module_ref','=',$this->id)
+				->find();
+		}
+
+		return $iio;
+	}
+
 	public function invoice_item($item_type) {
 		switch ($item_type) {
 			case 5: