problem in SEEBURGE BIC mapping adapter

Hi experts

I am using SEEBURGER MAPPING adapter for file to idoc scenario .I have to convert an input flat file into xml using BIC mapping adapter.The problem is that when i am giving input file to convert into xml ,the conversion is failing with a error that a special character(?) occurs in the begining of file.when we r opening the file then we r not able to see any special character.The file is in UTF16 Little endian encoding. we r unable to find that how the spechial character is coming in the input files and how to debugg it.Plz guide me how to proceed.Is there any function in SEEBURGER to remove special character from the source file?

Regards

Neha