Alert triggered for PO

Hi,

User has created std PO in poduction on 3rd Oct,2012. The Alert of new PO was triggered on 14th dec,2012 and was received by supplier.

I have checked the PO but no changes were done done in PO by user after 3rd oct,2012.

My question is how can supplier receive alert on 14th Dec,2012 for PO created on 3rd oct,2012.

What I need to be check.

Regards,

Vaibhav Virkud