This file is used for SAP financial purposes and this does interact mainly with the Banks. Banks have different format like bai, bai2 etc. BAI and BAI2 formats differ in their level of information detail. BAI does not separate out the incoming check line items by invoice subtotal reference. Conversely, BAI2 splits the check total into separate invoice references and associated payment amounts. As a result, your hit rate percentage of payment-invoice matching from each transmission is likely to be higher when using BAI2 rather than BAI formats.
Now coming to your question that you are getting a bai file and you need send to sap. Usually how we approach this is we will read the legacy file with file adapter and then will convert into the bai file format and drop the converted file on a shared drive. There are standard programs in sap which picks this file and loads the data in sap. If your client has different structure then the abaper may need to change the program accordingly.
The bottom line is the standard program in SAP expects this format and you using PI will make this file from your legacy file. How it loads into sap can be find from any of your FI consultant, he will be aware of all this.
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