Change Message type from Error to Warning

Hi,

We customize a Z table. We input the data via SM30.Some field input data is no in the field drop down list. The system give us a Error message like the following. We want to change the message type form Error to waring. Could you pls let me know how to change it?.Thanks.

==========================

Enter a valid value

Message no. 00 002

Procedure

Display the allowed values with F4 and correct your entry.

============================

Best Regards

Park