You should wait until you have your Permanent Resident Card. If you can’t do this, you will have to apply for a Travel Document (Permanent Resident Abroad) before you re-enter Canada. This application is for permanent residents outside of Canada who need proof of their status so they can return to Canada. The Confirmation of Permanent Residence (IMM 5292) is not enough to get you back into Canada if you leave.
Да, это то что у них написано. В Штаты нам этой формы хватало, но видимо для Рима не достаточно. Sorry.