Differenet BPEL instances write to same file using FileAdapter

Hi,
I want to write a file through BPEL using FileAdapter, But i dont want that whenever a new instance of BPEL is generated the new file is created.
I want all instances to write to the same 1 single file. Is it possible?
How can this be done?
Looking forward for your answer.
Thanks

See : http://www.customware.net/repository/display/FUSION/File+Adapter+-+Appending

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