That's about as good a recap as any. I have very few client's using AP retention, but I think basically you want to enter a rate in vendor maintenance where applicable and it will automatically calculate the retention amount when you enter an invoice for this vendor, but only if you select a subcontract cost type. As the pdf states, you can manually override the amount or zero it out during data entry. The retention rate and amont will be in the secondary grid, so they may want to move them to primary if they'd be adjusting retention amounts much. Let me know if you need more info or have any other specific questions Jeff.