The "wafl.default_nt_user" did the trick. I was reading back this forum and saw this thread. Netapp support did advise me of this setting. Apperantly the linux user does not have the permission to see the "deep" path what is exported.
Setting wafl.default_nt_user will effectively map any user we cannot otherwise map to some specific user. This would include pcuser, but is not limited to pcuser.
Or you can do a manual mapping in the usermap.cfg file, but this works good.