I'm not sure I see what you're saying. It's advice to users and it specifically says that it won't call the errhandler when success or pending. 

On Wednesday, January 21, 2015, MPI Forum <mpi-forum@lists.mpi-forum.org> wrote:
#472: Clarify behavior of multiple error handlers in a single call
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Reporter:  wbland                    |                  Owner:  wbland
    Type:  Text (only) changes       |                 Status:  new
Priority:  Forum feedback requested  |              Milestone:  2015/03/02
 Version:  MPI 4.0                   |  Portland, USA
Keywords:                            |             Resolution:
                                     |  Implementation status:  Unnecessary
-------------------------------------+-------------------------------------

Comment (by bouteill):

 About ERR_PENDING: should it be an advice to implementors, or should it be
 normative text ?

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