element-rules

 rules: {
                expiryOnDate: [
                    {
                        validator: (rule, value, callback) => {
                            if (!this.item.expiryControlType) {
                                if (this.item.expiryOnDate == null) {
                                    callback(
                                        new Error(this.l("ThisFieldIsRequired"))
                                    );
                                }
                            }
                            callback();
                        }
                    }
                ]
            },