Why terms of payment must be copied from invoice for joint venture?

Hi, Good day,

When I do the IMG customizing for vendor / customer tolerance under one Joint venture company code, the error message as below shows me that I have active the JV accounting and if so the payment terms must be copied from invoice and I need to check the box of "payment term from invoice".

After I un-check the box "JV Accounting Active" in company code global data, and return back this issue, then the error message disappeared.

I do not know why for joint venture accounting, the payment terms must be copied from invoice, is there some reasons to require this?

Thank you,

Annika W.