When selecting a supplier on a new PurchaseOrder, selecting the supplier from the list works properly, but when clicking on the supplier:
Received: <br /> <b>Warning</b>: call_user_func_array() [<a href='function.call-user-func-array'>function.call-user-func-array</a>]: First argument is expected to be a valid callback, 'ajax_perp_po_edit::change_supplier' was given in <b>/var/www/perpdevel/xajax.php</b> on line <b>104</b><br /> <?xml version="1.0" encoding="utf-8" ?><xjx><cmd n="al"><![CDATA[No XML Response Was Returned By Function doXMLHTTP.]]></cmd></xjx>