Invoice Reprinting

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We've been using BW for years. A new employee accidentally flagged TASK0009 as a virus and I had to manually restore it to the server. After the restore, the "reprint invoice" feature started working again, but now I noticed that only one person can use it at a time. When a second user tries to access the module, it says that the task is an exclusive option and that the user must wait for the other person to finish.

My question - was the reprint invoice module always an exclusive task because I have never noticed this before? Or did the employee screw up something I'm not noticing?

Thanks for your time.