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This is also the base for debtor and credtor codes.
You would have to limit those to.
It is a technical change ( lots of SQL ) . but you can ifcource try to make a new set of books with shorter codes.
And import the accounts after editing in Excel.

My account numbers at the moment are 8 digits because of the extra 000 in the department code. I don't use departments and would like to just have 5 digit account codes.