If an employee’s job description includes going on errands/post office, & he has OCD, does he have the right to refuse when asked?

Let’s say his illness triggers the need to stay in the office. So if a messenger run is requested, he’ll say he’s busy, when all he’s doing is “straightening” things, which means nothing important needs to be done at the moment and that he’s available. Would the HR manager waive that (his attitude) on his yearly... show more Let’s say his illness triggers the need to stay in the office. So if a messenger run is requested, he’ll say he’s busy, when all he’s doing is “straightening” things, which means nothing important needs to be done at the moment and that he’s available. Would the HR manager waive that (his attitude) on his yearly evaluation, since he has a mental condition and can’t help it? Or is the fact that he has two legs and is not PHYSICALLY handicapped, make his OCD irrelevant?
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