AME for Global Blanket purchase orders ?

Hello,

We are on Oracle R12.1.3

We wish to leverage Approval Management Engine for Purchase Order approvals.

I could not find a transaction type for purchase orders.

Is this feature available in R12.1.3 ?

Do we need to apply any patches ?

Is there a way we can use it in R12.1.3

Thanks in advance,

Martina