how to convert warning message MM071 into error message

Hello All,

I have flag deletion indicator for 1 material thru tcode MM06

Now i have to convert that error message into warning message..

For the same i went to path--spro - Mat mgmt-purchasing-Environmentdata-define attributes of System messages,but it didnt solved my purpose..

How to solve it...Helpful answers will be highly appreciated

Regards

NanoSAP