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Explanation: vaguely guessing from the word and my experience with .....sache constructions in this manner, the sentence more or less goes "....blah-blah....ist Vorbehaltssache".
If so, you could put something like
"....remains to be judged" or "....remains to be decided upon" at the end of the sentence.
Hope this works.
beermatt Local time: 14:40 Native speaker of: German, English PRO pts in pair: 53