validateRequiredField method
Implementation
String? validateRequiredField(String fieldEnum, {dynamic value}) {
final fieldControl = getField(fieldEnum: fieldEnum);
final data = value ?? fieldControl?.data;
final validationFnc =
_mandatoryValidationMap[fieldEnum] ??
_defaultMandatoryValidation;
final error = validationFnc.call(data);
return error;
}