MISSING VALUE is incompatible with datatype of domain <str>

  Explanation:  The specified MISSING_VALUE (RDO) or MISSING VALUE
  (CDD/Rep)  is  not  compatible  with  the datatype of the domain
  (global field).

  User Action:  Ensure that the datatype of the  domain  displayed
  in  the error message is consistent with the MISSING_VALUE (RDO)
  or MISSING VALUE (CDD/Rep) of the domain.