Enhancing CAT2 Screen using screen exit.

Question

I am working for a custmer enhancement whuch requires to include a input field on the CAT2 Main screen. I am using CATS005 exit & subscreen at the top of header area.
But with this I cannot use the values that is entered in this input field for processing as technically they have not included this subscreen in PAI module.
Here is the flow logic of screen 2000 of SAPLCATS
PROCESS BEFORE OUTPUT.
global module for global settings
MODULE D2000_GLOBAL_SETTINGS.
initialization
  MODULE D2000_INIT.
modify fields outside loop
MODULE D2000_MODIFY_HEADINGS.
Customer-Subscreen - carrier
  CALL SUBSCREEN CATS005 INCLUDING 'SAPLCATS' SUBSCR-005.
Header-area
  CALL SUBSCREEN CATS003 INCLUDING 'SAPLCATS' SUBSCR-003.
Worklist
  CALL SUBSCREEN CATS001 INCLUDING 'SAPLCATS' SUBSCR-001.
Entry-screen
  CALL SUBSCREEN CATS002 INCLUDING 'SAPLCATS' SUBSCR-002.
View-switches
  CALL SUBSCREEN CATS004 INCLUDING 'SAPLCATS' SUBSCR-004.
PROCESS AFTER INPUT.
  MODULE D2000_ABBRUCH AT EXIT-COMMAND.
Worklist
  CALL SUBSCREEN CATS001.
Entry-screen
  CALL SUBSCREEN CATS002.
Header-data
  call subscreen cats003.
OK-Code
  MODULE PROCESS_OK_CODE.
Can any body tell me how to achieve the values defined ain any Input field added using the screen exit.
Is there any other way to achieve this functionality...???

Answer 1

Check the documentation of the enhancment CATS0005
1.  You want to enter the customer fields along with the SAP fields on   
     the data entry screen. Proceed as follows:                                                                               
o   Define customer Include CI_CATSDB in the ABAP/4 Dictionary. Include  
     only fields in the customer name range in structure CI_CATSDB.       
     Otherwise, this may cause problems during a system upgrade. Use only 
     fields of type 'CHAR' and 'NUMC'.                                                                               
o   Activate the customer fields using a special Customizing transaction 
     for the Time Sheet.                                                  
Regards,
Naimesh Patel