Nick, that recommendation is absurd.  

Many of us sell to companies who often have POs up to 16 digits long.  We are not going to take that and manually paste it into the memo box, body of the letter, subject field of the email, or any other place.

The customer's PO field is populated and stored in the data.  Just fix QB to make it put the customer PO# on the darned statement.  Is it that difficult?  How can you expect any customer to pay off a statement when they have no reference number against which to reconcile it at their end? 

QUICKBOOKS NEEDS TO FIX THIS!