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• Operations allowed are:

  GT	Greater than
  GE	Greater than or equal to
  LT	Less than
  LE	Less than or equal to
  EQ	Equal to
  NE	Not equal to
  REF	Refers to

   
• All operation codes can be suffixed by a "P" indicating that the previous value of the nominated field should be used. Such conditions are only valid for "Update" operations. Also Part 2 of the condition must not be a literal if this type of operation code is used.
• No conditions are allowed if "Open" or "Close" are used.
• The "REF" operation code is only valid for "Insert", "Update" and "Read" operations.
• If the trigger is defined at dictionary level, the conditions can only involve the field to which the trigger is being linked.
• If the trigger is defined at the file level, the conditions can involve any other real or virtual fields in the file to which the trigger is being linked.

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