Hi,
There are some pre - requisites in order to get cash flow statement in SAP B1.
In Administration ---> System Initialization ---> General Settings ---> Display Tab
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These cash flow line items then will reflect in your Banking ----> Incoming & Outgoing Payment, in the payment means window as a drop down. You can select appropriate heading as per payment / receipt.
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I assume, there is a template for Cash Flow.
With the help of Cash Flow Statement Reports, you will be able to get the output.
Sorry to have missed one step. You will have to configure your relevant cash and bank accounts as "Cash Flow" and "Cash Flow Relevant" accounts through Chart Of Accounts.
Regards