Description of problem:

CFME VM Reconfigure, 
for a Powered OFF VM, 
with Physical Memory Guaranteed: 1024 MB, and Memory size 2048 MB, 
as follows:
To: Processor Sockets: 1, Processor Cores Per Socket: 4, Total Processors: 4
From: Processor Sockets: 4, Processor Cores Per Socket: 1, Total Processors: 4

Request fail on Error: [Cannot edit VM. Physical Memory Guaranteed cannot exceed Memory Size.]

Version-Release number of selected component (if applicable):
CFME 5.6.0.11-rc2.2.20160614152915_f315c68
RHEVM-3.6.6.2-0.1.el6

How reproducible:
100%

Actual results:
Eventually the desired Processor change do not appear in RHEV side.

Expected results:
Update Processor sockets/Cores per socket should work.

Additional info:
0. VM was win2008R2/ISCSI, but bug seems not related to VM OS, since it occurs on non OS/RHEL VMs as well.
1. The guaranteed memory do not exceed Memory size.
2. In evm.log this error do not appear.
[----] I, [2016-07-04T02:50:57.201294 #3095:4dbd9f0]  INFO -- : <AutomationEngine> <AEMethod vmreconfigure_request_approved> Sending email to <evmadmin> from <evmadmin> subject: <Request ID 1000000000035 - Your request to Reconfigure the Virtual Machine was Approved>

but there was a former same Processor change request, when the Physical Memory Guaranteed: 2048 MB, and Memory size 2048 MB, failing with the same error,
where this error does appear in evm.log:
[----] E, [2016-07-04T02:50:57.323180 #52824:10bb994] ERROR -- : Q-task_id([vm_reconfigure_task_1000000000034]) <RHEVM> Ovirt::Service#parse_error_response Return from URL: <https://10.35.161.51/api/vms/a2e8bc6c-02b6-426f-b382-c11a0c1550db> Data:<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<fault>
    <reason>Operation Failed</reason>
    <detail>[Cannot edit VM. Physical Memory Guaranteed cannot exceed Memory Size.]</detail>
</fault>