"due approvals" is correct and usable in written English.
It is typically used to refer to something that is required or necessary before certain actions can proceed. For instance, you could say "We are waiting on the necessary due approvals before starting the project."
At last Mr. Rameshwar retired in the year 2000 but remained at his position with due approval from the owner.
Written, informed consent was obtained after due approval by the local ethics committee.
Lion and Tiger blood samples were procured with due approval of the competent authorities of the States and Union Government of India.
All the institutions were visited and after explaining the study objectives and protocol, due approval was obtained from the respective head of the institution for inclusion in the study.
Samples from routine TB patients were used to reduce delays that would have been required due to approvals and consenting processes if patients had been approached.
Dr. Hernández Cárdenas has a patent application that is due for approval this month.
Joint laws on citizenship and passports, due for approval by August 1st, are still being argued over.
It will be heavily conditioned by further legislation, some of it not due for approval until next year.
Other legislation includes one on food safety and another, due for approval within the next few hours, will provide financial help for police, fire officers and others suffering respiratory problems from the 9/11 attack on New York.
As the draft of a document due for approval at a party conference this autumn, it is certainly meant to please German voters, many of whom remain glum at the prospect of losing their beloved D-mark notes next year and resent their country's long-standing role as the Union's main cash cow.
