Refresh Materialized View over DB Link

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DB B is connected over DB-Link with DB A. On B I created materialized view mav_test, that took about 40 seconds and works fine. If I try to refresh mav_test now e.g. with 'execute dbms_mview.refresh('mav_test','c');' and other commands, System B is turing in empty. It's the same query, so what's going wrong? I realy need help.

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