Issue: Error-Cause Attribute in Disconnect-ACK?

[Bernard Aboba <bernard_aboba@hotmail.com>]

Issue:  Error-Cause Attribute in Disconnect-ACK?
Submitter name: Bernard Aboba
Submitter email address: aboba@internaut.com
Date first submitted: May 22, 2007
Reference: 
Document: RFC3576bis-05
Comment type: Technical
Priority: S
Section: 3.4
Rationale/Explanation of issue:

In the process of editing the attribute table to address Issue 226, I noticed an oddity. 

RFC 3576 Section 3.1 states the following:

      It is possible that the NAS cannot honor Disconnect-Request or
      CoA-Request messages for some reason.  The Error-Cause Attribute
      provides more detail on the cause of the problem.  It MAY be
      included within Disconnect-ACK, Disconnect-NAK and CoA-NAK
      messages.

Why would an Error-Cause Attribute be included in a Disconnect-ACK?  It is not allowed in a CoA-ACK, for example. 
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