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So why is the rewrite not an issue?
Google sees the GET /nl/nl/process?Someparameter1=1&Someparameter2=2, never mind the 302 (which is a very obvious issue).
Then it sees the GET /nl/nl/SomeOtherPage.cms
To Googlebot it might as well be a meta redirect, which is an issue, as this will not pass pagerank. Server response is not different from a meta redirect....

Or should I interprete the last GET in some other way?

I agree on the .cms

Hi,

On an IIS system clicking a particular link the following response codes are returned:

GET /nl/nl/process?Someparameter1=1&Someparameter2=2

302 found

GET /nl/nl/SomeOtherPage.cms

200 OK

What concerns me, besides the obvious 302 and the cAmeLcAse canonical issues is the 200 response without a redirect.
What page will then be indexed, ranked and what effect does this have on the pagerank flow, if the 302 was to be changed into a 301?
Also would extention .cms be an issue?

Thanks for any answers.

Edit. I contacted the developer. He says it's a rewrite, not a meta redirect.
I still think, this rewrite is an issue? Canonical maybe?