Problem in table control wizard in module pool programming

Hi All,

i have created a Screen having two subscreens, one having a table control wizards, whenever user puts any entries in it and presses enter button, it is creating a blank lines before that line, i need to stop it as i wants that when user enters any values in the table fields, and presses ENTER button, it should not create a blank line.

I am doing some stuffs in PAI , but not getting desired result, please tell me where should i code for the desired result. Here is the code of my PAI of that subscreen.

PROCESS AFTER INPUT.

LOOP AT G_ZTBC_2014_ITAB.
     CHAIN.
       FIELD ZPAYMENTS1-SNO.
       FIELD ZPAYMENTS1-CDATE.
       FIELD ZPAYMENTS1-CHEKNO.
       FIELD ZPAYMENTS1-AMOUNT.
       FIELD ZPAYMENTS1-BANKKEY.

       MODULE ZTBC_2014_MODIFY ON CHAIN-REQUEST.
     ENDCHAIN.

   ENDLOOP.