Reusing a Schengen visa for another purpose

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I am an Indian citizen and I had visited Poland for a week in April and that Schengen visa (multiple entry) is valid till end of August. I would like to visit Denmark for a month in June. Can I do that ? I have an invitation from the company in Denmark.
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Reapply for a Schengen Visa? What do you Need? (Europe Visa)
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Images: Andrea Piacquadio, Anna Tarazevich, Max Mishin, Nataliya Vaitkevich