別べっ件けん

noun, noun which may take the genitive case particle 'no'

another matter; separate case; different issue

Used to indicate that something is a different topic, case, or project from the one currently under discussion. Often used in business or formal contexts.

• それは別べっ件けんで、今いま話はなしていることとは関かん係けいありません。

  That's a separate matter and has nothing to do with what we're discussing now.

• 別べっ件けんの打うち合あわせが入はいったので、先さきに失しつ礼れいします。

  I have a meeting for another project, so I'll excuse myself first.