Flat file DTP Loading Error

Hi SDN Guru,

I am loading Flat file to BI 7.0, I am loading around 61,000 (Sixty one thousand records), I am able to load upto Infopackage level data, but one I load DTP I am getting following error :

Data package 4 / 04.09.2013 11:13:03 / Status 'Processed with Errors'

Message no. RSBK257

How to racactiry in DTP level this issue.

Can u please anyone help me.

Thanks in Advance.......Master.......ASAP.

Regards,
Vijay