When I enter some value in TBM Generator, everything is disabled.

Question

Hello,
Very Good Afternoon!
I had created a Table Maintenance generator for a Z-table with a field : MANDT and PSTYV.
When I enter an invalid entry it is throwing an error message perfectly. But, when I try to remove that entry from the table it is not letting me to do that. All the functions are getting disabled.
This is the logic that I had written in the validation:
MODULE ZORD_ITM_VALIDATE INPUT.
DATA : L_PSTYV TYPE PSTYV,
        L_MSG TYPE STRING.
IF ZORD_TYPE-PSTYV IS INITIAL.
    CLEAR L_MSG.
  MESSAGE 'Enter item category Type' TYPE 'E'.
ELSEIF NOT ZORD_TYPE-PSTYV IS initial.
SELECT SINGLE PSTYV FROM VBAP INTO L_PSTYV
                         WHERE PSTYV = ZORD_TYPE-PSTYV.
IF SY-SUBRC <> 0.
CLEAR L_MSG.
CONCATENATE 'Item category' ZORD_TYPE-PSTYV 'does not exist in VBAP(Check entry)' INTO L_MSG
                                                              SEPARATED BY SPACE.
MESSAGE L_MSG type 'E'.
ENDIF.
ENDIF.
These are the modules generated :
PROCESS BEFORE OUTPUT.
MODULE LISTE_INITIALISIEREN.
LOOP AT EXTRACT WITH CONTROL
  TCTRL_ZORD_TYPE CURSOR NEXTLINE.
   MODULE LISTE_SHOW_LISTE.
ENDLOOP.
PROCESS AFTER INPUT.
MODULE LISTE_EXIT_COMMAND AT EXIT-COMMAND.
MODULE LISTE_BEFORE_LOOP.
LOOP AT EXTRACT.
   MODULE LISTE_INIT_WORKAREA.
   CHAIN.
    FIELD ZORD_TYPE-PSTYV .
    MODULE SET_UPDATE_FLAG ON CHAIN-REQUEST.
   ENDCHAIN.
   FIELD VIM_MARKED MODULE LISTE_MARK_CHECKBOX.
   CHAIN.
   FIELD ZORD_TYPE-PSTYV .
****Added By developer.
MODULE ZORD_ITM_VALIDATE. ->"I had written my code in this module. 
    MODULE LISTE_UPDATE_LISTE.
   ENDCHAIN.
ENDLOOP.
MODULE LISTE_AFTER_LOOP.
Any suggestions would be appreciated............
Regards
Kittu

Answer 1

Hi Kittu,
View maintenance has its own logic of performing validations, and accordingly changing the display of the screens (freezing/pop-up/warnings, etc). These are based on the Checks/Foreign Keys defined in the DDIC itself.
If apart from this you wish to do any additional validation, you can very well do that. But please refrain from using a message type 'E' within your code. By using that, you will be freezing the control of the View Maintenance program and the screen will freeze.
Instead, please use a Message type as 'W'. This will help you in identifying the error, but still maintain the screen as changeable, so that user can modify entered value.
Cheers
Rekha