ASR9000 multiple PPPoE sessions

Hello all
We try to understand aspects of the behaviour of ASR9K for PPPoE sessions. Specifically we see that after retraining of xDSL CPEs (and for as long as the old session has not been timed out) subsequent PPPoE session initiation attempts from the CPE are denied with the following message
(debug pppoe packet)
pppoe_ma[375]: Packet: [ERROR] Bundle-Ether100.321: Session established cannot re-send PADS for duplicate PADR with host-uniq tag: No error
Does the ASR9K perform any checks based on host-uniq tag to avoid duplicate sessions from same CPE?
Some CPEs after retraining take care of their previous sessions (they clear them - send PADT after retraining) but some others do not for the latter we see this behavior
Thnx

This works for on the ASA, the device works as a PPPoE client:
http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a0080ab7ce9.shtml

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ASR9000 multiple PPPoE sessions

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