Displaying Error Message

Hi All,

I am displaying three fields MARA-MATNR, MARA-PLGTP and MARA-ZZ_EXPCODE on the selection screen and validating the same. When i enter wrong value (Assume the value is 12) in the MARA-PLGTP field and prees enter i am getting the error as "The price band category 12 does not exit".

So now when i enter wrong value in the MARA-ZZ_EXPCODE and press enter i want the same format of error which i am getting for the MARA-PLGTP.

Is it possible?????

Regards,

Santosh