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During my last job, on my first project, my boss showed some feedback from a client on a mockup. One of the things the client pointed out was that one of the feedback messages on the mockup had a pretty serious spelling mistake (for those that know their Dutch conjugation: a DT-error).
However, this mistake was not actually a spelling mistake. There was some confusion about the tense I used on the verb in the Dutch message: I used the present perfect, but the client thought I used present simple. I'll post the specific error in a modified form in a comment, in Dutch. I explained this to my boss, who decided that I should just rewrite the sentence to avoid further confusion.
Seeing the recent question about What to do when a new employee makes basic spelling and grammar mistakes? reminded me of this situation, and it got me wondering how this similar situation should be handled. In this case, there isn't actually a mistake, but the client thinks there's one.
What is the appropriate action in this case?