How to read fieldcatalog of Data Entry View in CAT2

Hi,
     I have a requirement wherein I need to validate the time data of 'Data Entry View' in TCode: CAT2. Here, there is a table control which uses dynamic field catalog (for days Eg: MO 11/07, TU 11/08.....SU 11/13).
       Whenever a user enters the 'Key Date' from CAT2, the system automatically gets the Data Entry Period of that Key date.
For eg, let's say user enters Key date as '11/28/2011' then the Data entry period would be 11/28/2011 to 12/04/2011.
      Requirement: Now the system should allow the user to enter time for November month only i.e. 28, 29 and 30. It should not allow the user to enter time data for December. In short the system should allow the user to enter times of only one month.
      For this validation I'm using the User Exit: CATS0006 . Please suggest me how to read the above fieldcatalog,
And also let me know if this can be achieved by any other method.
Thanks,
Singh

Thanks Raymond. The problem is solved.
Below is some part of the logic...
Work area declaration
DATA: wa_check_table TYPE cats_comm.
Variables
DATA: w_cnt TYPE i.
Get the no. of records
DESCRIBE TABLE check_table LINES w_cnt.
Read the last record
READ TABLE check_table INTO wa_check_table INDEX w_cnt. "We can loop also
IF dateto4(2) GT datefrom4(2).
IF wa_check_table-workdate4(2) GT datefrom4(2).
MESSAGE e208(00) WITH text-001. "Appropriate Error Message
ENDIF.
ENDIF.

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