PPME error(68): Failed to transfer the source reservation

Hi, i using PPME 6.0 SP2, Windows 2008 R2, 2 nodes failover cluster, and trying to migrate one lun (Source VNX7500) to one lun (target VNX7600) and get the error

PPME error(68): Failed to transfer the source reservation

Log File PPME.log

10/14/2016:1:56:04 AM:API: Error: PR Keys found on Target disk during Setup:

Target Disk is harddisk4

Source Disk is harddisk1

harddisk4 has PR key :  0x23042304

please clear the key manually to proceed.

10/14/2016:1:56:04 AM:API: Error: Setup failed: PPME error(68): Failed to transfer the source reservation

I following the procedure describe in https://support.emc.com/docu56488_PowerPath-Migration-Enabler-6.x-User-Guide.pdf?language=en_US

with on node shutdown executing the following

powermig setup -techType hostcopy -src harddisk1 -tgt harddisk4 -throttleValue 0  -cluster

Any idea ?