Basically, there are many rules in terms of procedural admissibility for amendments. The main rules that we use are principle, scope, and the financial prerogative of the crown.
If an amendment is considered to go beyond the scope of the bill or against its principle, it will be ruled inadmissible. If an amendment would incur new spending for the government that is not already provided for, it will be ruled inadmissible.
When an amendment tries to amend a section of the parent act, in this case the Access to Information Act, that is not currently amended by the bill, it is frequently ruled inadmissible, because it's, in fact, beyond the scope of the bill.