Material Master - Same Description - Message No

Hi,

When i create the material master with the same description which has been created earlier, system does not give message "Material with the same description exists". I have seen in 4.7, but currently I am working on ECC 6.0.

So, some one can help me in providing the Message Class and No since i was not able to find the message class and no.

Note: Internal Number assignment have been configured for the material type.

Thanks in advance.

Regards,

Elanchezhian. K.C.