BAI2 format Change

Hi !

Could someone please answer my following question.

The Lockbox file which iam getting from the bak is differing from the SAP format and i spoke to the bank people and they have said that they will not be able to modify the file. in this fix, What should I have to do now? Should I have to ask for an ABAPer's help or so? How to deal with this exactly? I will be thankful if someone answers me in brief.

Points will be rewarded

Thanks