Most enterprise offers are "enrollment" offers. They can only be used to enroll in a course. If a learner has a cap of $500 and they enrolled in 2 courses costing $200 each, they only have $100 remaining and would only be able to enroll in courses costing $100 or less. Please reach out to your Account Manager if you have questions or wish to discuss options for this learner.
If you have questions about this or who your Account Manager is, please reach out to customersuccess@edx.org.