Solved Prob FLEXlm (License server does not support this feature(-18,327)

A little (in the end really funny) true story. I think it could helpful
to somebody (or give you a reason for a little smile before the
weekend):
A really frustrated costumer called me last week an told that his INV 8
Pro 20 seat license is out of order. It never worked.
Ok. So I checked his license file, debug.log and so on.
Found no errors. Made him uninstall and new install the FLEX.
Result: His INV Series 6 and INV Series 7 run with 20 seats, INV8PRO: no
way, same error.
Searching tho NG's, knowledgebase ... No solution found.
I made a support call to Autodesk, submit them all informations and
files. Four days later an answer came in: "Probably there's a bug in
your license file, try to recieve the file from the AuthCenter in a
zip archive not plain text". OK, done, same results.
And just by chance I looked to the costumer's auth request he send
to the AuthCenter: "Inventor Series R8"
Second look into the license file: feature code "46100INVBUN_8_0F"
My first thought: "Should it not be "46000INVPRO_8_0F"?"
My second thought: "IT's impossible!"
Check the serialnumber by our distributor: "It's a INV 8 Pro number!"
Calling the costumer, explained him the error. The costumer was really
amused about his obvious mistake, we talked and laughed a lot.
In the end I must say that this special case shows me how important
it is to check all infos from costumers three or four times.
Regards

Andi