Bank Statement BAI file with last character 3 in tag 1

We received bank statment file in BAI2 with version 3. We can see in tag 1, last charcter which shows version of BAI is 3. We tried to load with mapping where BAI2.crtl file attached. The bank loader program shows error message 'bank file is not BAI2' . When we change last character of tag 1 from 3 to 2 , it is loaded. I wanted to know what is BAI file version 3 and how we can load it in interface table using standard bank statment load program. What will be control file to create bank statement mapping for BAI version3 bank statment files

Thank you in advance