Want to validate a field on screen

want to validate a field on screen w/o pressing enter after the input is given either thru f4 help or manually.
Its a normal selection screen it is not a dynpro
is it possible?
The customer wants it to be so!!!
Can i assign user-command to a field on screen?
please help me asap. all suggestion would be rewarded.
Regards

Hi,
 You can do via F4 help validation but for manual enter it is not possible as you need some action.
Try out The Sample Code for F4
TYPES: BEGIN OF t_reques,
 lgnum TYPE lgnum,
 END OF t_reques.
DATA:i_reques TYPE STANDARD TABLE OF t_reques.
SELECTION-SCREEN: BEGIN OF BLOCK b1.
PARAMETER: p_ware TYPE lgnum OBLIGATORY.
SELECTION-SCREEN: END OF BLOCK b1.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_ware.
SELECT lgnum
 FROM T301
 INTO TABLE i_reques.
PERFORM f4_help USING i_reques CHANGING p_ware. "SUBROUTINE FOR F4 HELP.
 SUBROUTINE FOR F4 HELP. *
 -->P_I_REQUES text
 <--P_P_WARE text
FORM f4_help USING p_i_reques
 CHANGING p_p_ware.
 CALLING FM F4IF_INT_TABLE_VALUE_REQUEST FOR F4 HELP. *
CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
 EXPORTING
 ddic_structure = 'LINK'
 retfield = 'LGNUM'
 dynpprog = sy-repid
 dynpnr = sy-dynnr
 dynprofield = 'P_P_WARE'
 callback_program = 'ZTEST' <<Your Program Name
 TABLES
 value_tab = i_reques
 EXCEPTIONS
 parameter_error = 1
 no_values_found = 2
 OTHERS = 3.
IF sy-subrc <> 0.
 MESSAGE i006(zmm_ab).
ENDIF.
ENDFORM. " F4_HELP
Rgds,
Abhishek

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Hi
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902434 wrote:
Hi,
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Want to validate a field on screen

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