Task level budgetary control for Purchase Order - any workaround?

Summary

Task level budgetary control for Purchase Order - any workaround?

Content

Our customer migrating from EBS to cloud, we are looking for any kind of custom solution where we can validate Purchase order value with the project and Task available budget before it gets approved. We cant change the overall resource structure but we are exploring any solution using personalization, interface or PaaS development.

Appreciate any suggestion to achieve this.

In the meanwhile if Oracle can give release plan with the task level budgetary control, it will help.