Question about COPS PR

["xubo" <swanbo@huawei.com>]

Hi,
I have three question as follows:

1.SSQ/SSC
When synchronization is complete, the PEP MUST issue a
synchronize state complete message to the PDP.If the SSQ have a client
handle object,but PEP has performed the  synchronization and issues a SSC
with wrong client handle. What PDP will do? reissue the SSQ or send other
message?

2.DRQ/RPT
Some messages,such as DRQ and RPT, need not be responsed. But how the PEP
knows if they are received by the PDP? And if there are wrong information in
them ,what PDP will do ?

3.RPT
"Reports can also be unsolicited and all unsolicited Reports MUST
   NOT set the solicited message flag in their COPS message header.
   Examples of unsolicited reports include 'Accounting' Report-Types,
   which were not triggered by a specific DEC messages, or 'Failure'
   Report-Types, which indicate a failure in a previously
   successfully installed configuration .  " ---in the COPS PR
Whether I can consider from "previously "that there are at least one RPT
corresponding to every DEC. Then, how I distinguish one corresponding to a
specified DEC from others? if PDP receives a RPT without Client-SI,What it
will do? ignore or delete ?

Thanks!