Mne21n check value in BSART

Hi,
how do I step by step check in tcode mne21n, when user select value in BSART I have to display a meesage by the value which was selected
I found the program name SAPLMEGUI
please display the code & where to insert it
Thx

Hi,
  In order to get the exits related to the program get the dev class of the program and then go to transaction SMOD and press F4 on the Enhancement box and put the dev class in pacakage which would be ME for PO..so you would get a list of enhancements linked to your program. Then in order to get better understanding of the customer exit check the documentation in order to check the documentation enter the name of the enhancement in SMOD choose documentation and hit the display button . You can also check SPRO and navigate to the correct hierchy and check the documentation there too.
In order to check the procedure on how to implement a user exit please search SCN, you would find several links.
Regards,
Himanshu

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