BDC with Table Control Problem -- Urgent

Hi Experts,

I'm facing one problem with table control while doing BDC. In the table control, only three lines are visible. After filling three lines information, i need to scroll the table control to enter fourth, fifth and so. But i'm getting ok-code as '/00', which is not wrking and when i tried to populate values in fourth row, the third row values are replaced. What should i do now? Is there any solution for this. Please suggest me ASAP.

Thanks & Regards,

Siva Sankar.