Data Exch. Line No. is 0 when importing .txt bank statement using Data Exchange Definition

Hello everybody!I have just signed up because I need advice from experts.I have this problem - When I import .txt file for Bank Reconciliation using Data Exchange Definition,everything is fine except value of the "Data Exch. Line No." field,which is 0.Because of that I cant see the detail information about transaction.Can you help me with this? Thank in advance