Purchase approval Workflow in Navision

Hi all! I know that Navision doesnt have a full purchase approval workflow. I need to have some kind of PO $ limitations. How can we ensure that a Buyer does not exceed his allowed purchasing power? System limits entry? System allows some kind of workflow?. If there is an Add On there , how is it, if someone has used that?? Thanks

We have this add on. Let me know if you want details/pricing

Ok! Give me details on: - price - How it is working? Thanks