I have the same scenario where I need to invoice hourly services against a customer's PO number and I need to know when I reach 90% of the Not to Exceed amount of the PO so that I can notify them that we're either going to stop work or they need to issue us a changer order to the PO.

It seems like the QB help desk is not reading the questions. This has nothing to do with Vendors. We are the vendors.

The customer Credit Limit does not help. I had a client issue us a purchase order for $10,000 so I put that in the credit limit. Never get a warning until they stop paying invoices and the open balance goes to $10,000, not a warning when I've invoiced them a total of $10,000.

This should be a basic feature of the Professional Services version of QB.

Tony