In Ztable creation, How can we display error message for a 'To date' field.

Hi all,
I have a requirement like this.
There r two fields in ztable. From date and To date.
The field 'To date' in table ZKM007 is taking before date than From date field.
To date should always be greater than from date i need to throw an error or don't allow to enter date if date is less than From date.
How can we do this?
Can any one help on this?
Rewards to all.
Thanks & Regards,
Anu.

I have written below code at event "Creating a new entry" (05) in table maintainance generator.But it is not working. If we give the to date < From date ,
it is saving.
Can any one help on this code? Pls Give me code And which event i have to put this?
***INCLUDE LZEXE3F01 .
FORM AT_entry.
IF ZEXE3-TODATE LT ZEXE3-FROMDATE.
MESSAGE I001(0) WITH 'ENTER TO DATE GREATER THAN FROM DATE'.
ENDIF.
ENDFORM.
Rewards to all.
thanks
Anu.

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* ls_fieldcat-ref_fieldname = 'ANLN2'.
* ls_fieldcat-ref_tabname   = 'ANLA'.
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*    ls_fieldcat-fieldname     = 'GRUFL'.
*    ls_fieldcat-ref_fieldname = 'GRUFL'.
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*    CLEAR ls_fieldcat.
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*    ls_fieldcat-tabname       = 'IT_OUTPUT'.
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*    CLEAR ls_fieldcat.
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* ls_fieldcat-fieldname     = 'MESSAGE'.
* ls_fieldcat-seltext_l     = 'Status Message'.
* ls_fieldcat-tabname       = 'IT_OUTPUT'.
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Message was edited by: M Petter

In Ztable creation, How can we display error message for a 'To date' field.

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