"retroacting" (one word) is a real word, but it doesn't seem to fit your sentence. I cannot exactly understand what you are trying to say.
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GPY"retroacting" (one word) is a real word, but it doesn't seem to fit your sentence. I cannot exactly understand what you are trying to say.I guess the term for this is "back-dating" in the US. Some people back-date for insurance and other purposes.