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In the invoice, click on the "Tickets" button. This will open the
"Tickets" window. In the "Tickets" window, click on the "Multiple
selection" button. This will allow you to select multiple items that can
only be used once.
I'm not sure what you mean by "remove duplicates" but you can use
<CODE>groupby</CODE> with <CODE>as_index=False</CODE> to get a
<CODE>DataFrame</CODE> with the duplicates removed.
<CODE>df.groupby('ID', as_index=False).first() </CODE> If you want to
just keep one of the two duplicates then you can us...
