How to keep consistency with previous data

One day you find you are using wrong property for Resources, what should you do for previous data?

For example, about Identifier in Patient, you used SB (social beneficiary identifier). But after a few months, you find the number you regarded as SB is actually TAX (tax id number), and you want to start to use TAX instead of SB.
But previous Patient resources are stored with code SB, so I want to revise the previous data to keep consistency.

However, I don’t want to touch data itself since it is not safe to do it.

Are there any good ways to keep consistency for data?

Thank you.

Already asked and answered here:

1 Like