Solved
@boneyard: no not a character. Somewhere in the Policy package on the FGT a prefix is used which is a reserved prefix on FMG. In this case it affects vpn manager in FMG. VPN Manager only exists in FMG and not on a FGT so FGT will not complain about it. FGT only gets depolyed what the VPN Manager in FMG produced so to say.
The easiest solution might be to get yourself a backup file from your FGT, open it in text editor of your choice and search for that prefix and change it wherever it occurs (but of course change all occurances to the same ;) ).
Then try to import into FMG again.
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