Mi componente donde paso validar prop ->>>>

 <div className="label-input-container activity-reason-dropdown"> <Dropdown dataAutomationId="identification-activity-reason" name="identificationActivityReason" label={<Translate id={isFromParameter ? 'updateParameter.updateReason' : 'commonComponentsLabels.activityReason'} />} values={options} disablePortal disableClearable mandatory **validate={(value: any) => { val(value); }}** customDropdownClass="activity-dropdown-heigh-issue" placeholder="Select Reason" /> </div>

validador función intermedia ->>>>

 const val = (value: any) => requiredActivityReason(value, customProp);

función de validación real ->>>>

 export const requiredActivityReason = (inputValue: any, customProp: any) => ((inputValue || typeof inputValue === 'number') ? undefined : 'Please select activity reason');