Change invoice pdf filename @ email attachment

[Acidburns]

When i send "Invoice created" email or "Invoice reminder" the client recive the invoice .pdf file but the name on it its only {YEAR}.pdf

 

My both Sequential & Custom Invoice Numbering Format is set to: {NUMBER}/{YEAR}

 

When i go to client invoice, and when i download the invoice the filename is okey (Invoice-{NUMBER}/{YEAR}.pdf)

 

But when is attached to email templates , the filename is {YEAR}.pdf

 

How and where can i change that?