I found this hit
http://www-01.ibm.com/support/docview.wss?uid=nas1fcc69da6bd7ff10186257236006882b5
Since you're talking about a switch test (we're in the middle of a live 
switch test as I type) this old V4 situation might still apply:
Problem Summary: 
DDM fails from V4R3 AS/400 System to V4R4 AS/400 system with messages: 
CPF4734 return code x'080F6051', CPF9162, CPF4207, and CPF4064 return code 
x'080F6051'. 
Resolution: 
Use the WRKCFGL command, and look for QAPPNRMT on the target system. Find 
the entry for the source system. If it is configured for Secure Location 
(SEC LOC) *YES, change this to *NO. The DDM application will complete 
successfully. 
References: 
APPN Support manual, SC41-5407-00
Distributed Data Management manual, SC41-5307-00 
Maybe your WRKCFGL needs a little work?
Another resolution password hidden at IBM was:
SNADS Not Working in One Direction
 Incident Summary 
Problem Summary: 
SNADS distributions fail to send out of the distribution queue in one 
direction between two iSeries systems. The distribution queue status is 
Rty-Wait or Rty-Fail. 
Resolution: 
Check the SNADS sender job in subsystem QSNADS. The job will have the same 
name as the remote location name used in the configuration of the 
distribution queue. 
A common error is CPF4734: 
Message . . . . : Evoke function for file xxxx in library yyyy for device 
zzzz rejected. 
Cause . . . . . : The remote system has rejected the attempt by your 
program to start a program in that system with Systems Network 
Architecture (SNA) error code 080F6051 . 
If this message is present, look for a corresponding CPF1269 on the target 
system. This message indicates the source of the problem. The resolution 
will vary, depending on the reason code found in this message. 
References: 
None. 
Remember, don't just rely on google or yahoo - it pays to use the IBM 
search window. 
Rob Berendt
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