When you create an Interfund Application and then modify the fundid on the Interfund Application record before posting, the fundid on the Application tab and the fundid in the Payment plan tab will change, but a fundid field on the application record is not changed. This is an issue that will be fixed. 

Until then, when you encounter the **W Fund in application does not match any in payment plan
warning in an Edit report, review the Payment Plan tab for the correct fundid values and if they are correct, do not be concerned about the warning.