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   Indicates the criterion used to select the records of the child file that
   satisfy the 1:N relation. dBsee automatically computers the filter
   expression, and displays it on the definition frame. In this option,
   eventual modifications can be added to what is proposed by the system.

   You can insert, as a condition filter, a user defined function or a memory
   variable, set in the Symbols environment. By using the Alt-1 keys
   it is possible to insert or modify the filter expression on rows.