Whenever I use "test" inside a "logical" Rule on the LHS, I get the exception
error:

Unexpected exception:
jess.NodeJoin cannot be cast to jess.Node2

How can I avoid this?

(ie)

(defrule xyz
(logical
..
...
  (test (< ?dt_x ?y))
);; Logical
=>
(
.....
)


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