@Westknight 

As you surmised, the response from @Jovychris_A is incorrect.  You're correct that the donation should post to a liability account.  Set up an other current liability (OCL) account called "Due to Foundation" or whatever makes the most sense to you.  Then, post the deposit to the Due to Foundation OCL account.  Assign the same Due to Foundation OCL account to the payment made to the Foundation.  That will zero out the liability account and keep this off your Statement of Activities.