More fixes for invoice_to, fix PushNew on belongs to relations

app/Models/InvoiceItem.php

@@ -23,6 +23,9 @@ class InvoiceItem extends Model
 	protected $dates = ['date_start','date_stop'];
 	public $dateFormat = 'U';
 
+	// Array of items that can be updated with PushNew
+	protected $pushable = ['taxes'];
+
 	private $_tax = 0;
 
 	public function invoice()