It's not another planning variable,
instead,
do something like

when
  ...
then
   insertLogical(new CustomerVisitArrivalTime(...));
end

when
    CustomerVisitArrivalTime($c : customer, $a : arrival)
    not CustomerTimeWindow(customer == $c, $a > start, $a < end)
then
    insertLogical(new IntConstraintOccurrence(...))
end

See nurseRosteringScoreRules.drl for an example of use of
insertLogical's like that

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