FMServer Warning 661

[TJ53]

I use the separation model and have different privilege sets and accounts defined in the data file. On the other hand, the interface file is configured to be opened with a common "User" account and privilege set. Every time a user opens a database I get the following FMServer warning:

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FileMaker Server x.x.x on SERVER reported the following event:

2011-07-19 09:47:12.013 +0200 Warning 661 SERVER Client "xx (xxx) [192.168.2.112]" authentication failed on database "Data.fp7" using "User [fmapp]".

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Is there a way to avoid this warning without having to create the same accounts in the interface file? Thanks in advance!