The part of the sentence "were only allowed for" is grammatically correct and is very commonly used in written English.
For example, "The use of fireworks were only allowed for special occasions."
It is a regulation that needs to be looked at because it encourages deception, just as in the old days when replacements were only allowed for someone who had been injured.
But Xenon, which actually began life on the ST before landing on the Amiga (sacrilege!), was pretty quickly trumped by its own sequel, bearing the subtitle Megablast and looking slick enough to style your late-80s spiky hair with, which you were only allowed for the summer, while school was off.
Incidentally, my partner once looked into getting a civil union, and were dismayed to discover these are only allowed for same-sex couples.
The current legal limit for a termination is 12 weeks, after which it is only allowed for certain "social" reasons, such as if the woman was raped or is a single mother.
The school, which takes pupils from across London, was also told to stop citing attendance at a Catholic primary school as a criterion, as this is only allowed for designated feeder schools.
Moreover, OSA will be only allowed for those users located inside free primary activity areas.
In traditional systems, access to databases is only allowed for internal users via internal applications.
Interband transitions under xy polarization are only allowed for the states with the same parity, whereas those under z-polarization are uniquely for states with opposite parities.
Instrument flight rules are only allowed for aircraft equipped with SCAT-I.
Acet is only allowed for horses that test positive for HYPP and have HYPP status noted on their registration papers.
Dose re-escalation after reduction is only allowed for sorafenib/placebo.
