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NetSuite Professionals

Here’s the code sample if anybody else is interested:

function fieldChanged(scriptContext) {
        if(scriptContext.fieldId == "entitystatus"){
            
            var fieldValue = scriptContext.currentRecord.getValue({
                fieldId:"entitystatus"
            });
            
            if(fieldValue == ENTITY_STATUS_CLOSED_LOST){
                scriptContext.currentRecord.getField({fieldId:"winlossreason"}).isDisabled=false;
            } else if (fieldValue != ENTITY_STATUS_CLOSED_LOST){
                
                scriptContext.currentRecord.getField({fieldId:"winlossreason"}).isDisabled=true;
            }
        };     
    }