Are you sure about that?...I'm pretty sure that you will need the ECA if you try to claim points for the Degree completed outside of Canada. You only don't need the ECA for your Canadian post-graduate Diploma. Otherwise, how would IRCC know how to rank your non-Canadian qualification?
If the ECA comes back as a Bachelor's Degree, then you can select 'Two or more certificates, diplomas, or degrees. One must be for a program of three or more years'. You do not have a Master's, so you cannot claim 'Master's Degree'.
To follow up on that:
Based on what the IRCC website says, it doesn't indicate that you get an exemption for assessing your foreign degree just because you have a Canadian credential... you still need to get the foreign credential assessed...
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http://www.cic.gc.ca/english/immigrate/skilled/assessment.asp
Have your education assessed — Skilled immigrants (Express Entry)
An
Educational Credential Assessment (ECA) is used to verify that your foreign degree, diploma, certificate (or other proof of your credential) is valid and equal to a Canadian one.
Who needs an ECA?
If you have a Canadian degree, diploma or certificate, you do not need to get an ECA for
that credential.
You will need to get an ECA for
your foreign degree, diploma or certificate if:
- you want to be considered for the Federal Skilled Worker Program (FSWP) under Express Entry, and
- you want to receive Comprehensive Ranking System (CRS) points for your foreign education
- for yourself as an Express Entry candidate, or
- for your spouse or common-law partner coming with you to Canada.
To be eligible under a) or to get points under b) you must include ECA results as part of your Express Entry profile.