relation <str> specified reserved for data definition

  Explanation:  An attempt was made to compile a query or  perform
  an  incompatible  data  definition  language operation against a
  table specified in a RESERVING clause with  the  table  reserved
  for SHARED DATA DEFINITION or EXCLUSIVE DATA DEFINITION.

  User Action:  Commit or rollback  the  current  transaction  and
  start  another transaction that is compatible with the operation
  being attempted.