It's not uncommon. The lingo on that would be a “reversed reprofile”, whereby money, instead of being reprofiled into a future year, is brought back from a future year into this year. Next year's main estimates that I mentioned will reflect a decrease in that program.
The issue there is it aligns the payment to Bombardier for the eligible costs they've incurred under that program. They've advanced the work, but the payment will be made when they need it, because the project is completed.