I haven't used Blanket Purchase Orders in Sage 300 as yet and I have a customer who wants to implement them. 

I see that I can set up an order, designate it as a Blanket PO, and provide a maximum number of $$ allowed to be on the order.

And, then...what is the next step to get a call-off on that Blanket?  I need to create a PO to send to the vendor to say 'send me NNN widgets'.  I don't see how that is done.  And I can't seem to find it in the documentation in the KB or help.  

So, if anyone could provide the 'next step' info, I would be very grateful.  And, are there any *gotchas* about using them?   Or a better method to achieve the same result?