The phrase 'requiring not only' is correct and usable in written English.
You can use it when you want to emphasize that something needs more than one element or action to be accomplished. For example: "Success in this job requires not only hard work, but also extensive knowledge of the industry."
The species found displayed specific habitat requirements, often requiring not only the presence of reed, but also the presence of loose sandy bedrock below the reed bed.
Either way, the system is a bit more cumbersome than conventional film or video cameras, requiring not only a cameraman but at least three other technicians trailing behind.
In requiring not only relief from active discrimination but affirmative acts of accommodation, the Americans With Disabilities Act goes further than what the equal protection guarantee itself requires.
The study of human evolution is multidisciplinary, requiring not only physical anthropologists but also earth scientists, archaeologists, molecular biologists, primatologists, and cultural anthropologists.
It already significantly narrows the possibilities of a strike by requiring not only a majority in favour of strike action, but a turnout of at least 50% of those entitled to vote.
Their development will come gradually over years, requiring not only new technology and investment, but also rules and systems to assure the privacy and security that might make individuals and companies willing to share information.
Their feat required not only athleticism but also efficient rope- and equipment-handling skills.
The creative act requires not only freedom but also this assumption of freedom.
"It's going to require not only monetary policy reform but also fiscal policy reform".
They are hard to reach, and reaching them requires not only talent but endurance and dedication.
Interpreting these requires not only different skills from conventional mathematics, but a different way of thinking.
