converting information into error in message class

dear all,

i have to convert message class 860(iw) into the type error , now when i creating service order (iw31) ,in the componenets tab we have to give batch type , if we havent give any batch , now it showing as a information i need to convert this as a error type . i have used oba5 but it asking me application area . so i have serached all PAI modules in SAPLCOIH , but i cannot find the include where this message placed ,.Please help me with this

Thanks and regards