Host variable <str> is based on a structure defined more than
  once.

  Explanation:  The named host variable is based on a structure
  that is defined more than once in the file being precompiled.
  Either the user defined the structure more than once in a single
  C procedure (which is illegal in any C program), or there is
  more than one procedure that defines the structure (legal in C,
  but the SQL C precompiler does not recognize that the structures
  are in two different procedures and generates this error).