In response, we have:

1. Archived predecessors (currency reference year 2007, January 1997 to August 2018) by renaming with an "_07" specifier, marking metadata as discontinued, and segregating in the catalog. 
2. Created one-for-one replacements (reference year 2012) with an unchanged start date.

Properties are otherwise unchanged. There is no change to mnemonics. Geo coverage is national. Figures are millions of constant year-2012 (Mil. 2012 CAD) or chained year-2012 Canadian dollars (Mil. Ch. 2012 CAD), seasonally adjusted at an annual rate (SAAR).

The predecessors reside in the historical catalog (Canada » National accounts » by Value Add » Monthly » Reference 2007) and include, for example:

• NACBPTT_07AM.ICAN = [DISCONTINUED] Production approach - Gross domestic product at basic prices - All industries [T0001], (Mil. 2007 CAD, SAAR)

The replacements reside in the historical catalog (Canada » National accounts » by Value Add » Monthly » Reference 2012) and include, for example:

• NACBPTTAM.ICAN   = Production approach - Gross domestic product at basic prices - All industries [T0001], (Mil. 2012 CAD, SAAR)
• NACBP325AM.ICAN  = Chemical manufacturing [325], (Mil. 2012 CAD, SAAR)
• NAHBP4851AM.ICAN = Urban transit systems [4851], (Mil. Ch. 2012 CAD, SAAR)

Because catalog locations are subject to change, the upper-right search box on DataBuffet.com provides a "find in catalog" mode that accepts a mnemonic.