Warning message: Defining credit\checking accounts as a cash account can affect the results of the cash flow report

Hi,

In Incoming Payment->Payment Means window, under the Checks tab, the users select the Bank GL directly, as they do not use any clearing account or the Deposits features of SAP.

The Bank GL is marked as a Cash Account, and is linked to a Bank defined under House Banks.

The users are getting this warning message:

Defining credit\checking accounts as a cash account can affect the results of the cash flow report.

The system displays 2 buttons: Continue and Cancel.

My question is why is this warning message coming, and how can I avoid or suppress this warning? If I untick the Cash Account checkbox in the Chart of Accounts, then this warning does not come, but I do not want to uncheck it, as it is actually a Cash Account.

Thanks.