Available-to-promise (ATP) is a business function that provides a response to customer order enquiries, based on resource availability.

Available-to-promise (ATP)

Oracle Data Sheet on Available-to-promise (PDF)

Automated available-to-promise is achieved by giving order takers access to inventory and capacity information, and in some cases even vendor information, so that they are able to commit to reliable delivery dates while the customer is still on the phone.