ME21N error message dsplay

Dear Group members,

I did the user exit enhancement for ME21N. It is working fine.

but the only problem is "instead of error (E) message it is showing the

information ( I ) message.

i write the code ( MESSAGE 'J1ID - Not maintained' TYPE 'E' ) like this.

but it is showing 2 information messages only not error message.

1. J1ID - Not maintained

2.System error (error in method PO_POST)

please give the solution.