In terms of why it's in the supplementary estimates (A), it's simply because it didn't make it in time for the main estimates. As such, in order for us to actually spend the money this year, we have to come before you today, as part of your process, to get that on our reference levels.
Evidence of meeting #152 for Government Operations and Estimates in the 42nd Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was year.
A recording is available from Parliament.