Hi, Barb,
Of further note, using an account number changer that is compatible with Ledger 9.0 would change the account for all years of data currently stored in Ledger 9.0.
If, however, your goal is to change the number/code for the current year only in Ledger 9.0, you should create a new account.
Again, I'm not certain of the version, etc. of Account Number Changer you are using and you should verify with AIM Services that it is compatible with Ledger 9.0.
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Regards,
Softrak Tech Support