The start date of the crediting period for any transition project or CPA remains unchanged i.e. it is the date as registered with the other standard from which the project is transitioning. 


The transition project or CPA can request issuance of GS-VERs or convert issued GS-CERs to GS-VERs for a retroactive period. The retroactive period can be started from which occurs later:

  • The crediting period start date with the other standard; or
  • A maximum two years before the date of first submission (submission for preliminary review)