The phrase "a separate requirement" is correct and usable in written English.
It can be used when discussing conditions or criteria that are distinct from others in a given context.
Example: "In addition to the standard application, there is a separate requirement for international students to submit proof of English proficiency."
Alternatives: "an additional requirement" or "a distinct requirement".
If you are taking a leave of absence, working with OIA is required and a separate requirement from anything you must do or file for your academic department.
A separate requirement in the new form raises other cost issues, since it requires employers to provide documentation for a degree when using exemptions provided under the law for H-1B-dependent employers.
All aid, however, is subject to a separate requirement that Egypt abide by the peace treaty with Israel.
And Cruz's sleazy innuendos about hidden foreign money are undercut by a separate requirement to disclose any transactions with a foreign government — going back 10 years.
The NAB is also challenging in court a separate requirement that its members file on their Web sites detailed quarterly reports on their programming and their dealings with underserved communities.
Some of the same companies that had pressed for action worry that they will be forced to comply with two standards: the stricter specifications that California imposes on its massive auto market and a separate requirement for the rest of the country.
MI6 restored a separate requirements department after a decade or so in which, for economy reasons, that activity had been blended with operational groups.
The best warnings also indicate that the responsible use of sources is part of the writing process, not a separate legalistic requirement.
The senior essay may be related to the subject matter of a course, but the essay is a separate departmental requirement in addition to any work done in a course and does not count toward the grade in any course.
The July Suspicious Activity Report by North Fork that flagged Mr. Spitzer's transactions picked up three wire transfers totaling roughly $10,000 to QAT International, in what appeared to the bank as a possible attempt to avoid a separate legal requirement that banks notify the Treasury Department of transactions of $10,000 or more, officials involved with the case have said.
The senior essay may be related to the subject matter of a course, but the senior essay is a separate departmental requirement in addition to any work done in a course and does not count toward the grade in any course.
