The phrase "allowed to make only" is correct and usable in written English.
It can be used when specifying limitations or restrictions on what someone is permitted to create or do.
Example: "In this project, you are allowed to make only minor adjustments to the original design."
Alternatives: "permitted to create solely" or "authorized to produce exclusively".
But the church is allowed to make only cars, not Christians or capitalist converts.
BT is allowed to make only a 10% return selling access to its network to other ISPs.
Everyone should be allowed to make only one taxpayer-funded paycheck at a time, period.
They have been allowed to make only one phone call home (which I missed).
Another group of participants was allowed to make only snap judgments When probed a few weeks later, those participants who had made quick judgments expressed greater satisfaction with their selection than participants who had taken the time to consciously evaluate the options.
(3) Subjects were allowed to make only one choice.
Under the new law, the city will be allowed to make decisions only on renewing its own city rent laws and deregulating certain categories of apartments.
The manufacturers of prescription drugs are allowed to make claims only about efficacy and safety that are based on results from controlled clinical trials approved by the F.D.A.
He was not allowed to make photocopies, only to take handwritten notes; the archives were haphazardly organized and not entirely open; he had to spend time pursuing queries from Weinstein, who does not speak Russian, instead of relying on his own judgment about which records to examine; and, eventually, his relationship with the keepers of the historical material deteriorated.
But the companies might be allowed to make the drug only for a limited period of time.
The organ procurement organization in each district is allowed to make offers to only a few hospitals at a time — usually three to five — and the hospitals have an hour to respond.
