What is the test for giving the father an "up front credit" for child support for travel costs?

Ontario, Canada

The following excerpt is from Choudry v. Cater, 2018 ONCJ 238 (CanLII):

In the result, Quigley J. declined to give the father an “up front credit” for child support in Morrone v. Morrone. He was concerned that the father may not travel but then get the child support credit anyway. Instead, he ordered the mother to share the father’s travel costs and ordered that the father could claim a credit in future years if the mother failed to reimburse the father.

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