Gaps in audit numbers

In the Sales, Purchase and Nominal Ledgers, each Transaction has a unique Audit Number, also known as Audit (Header), and each individual Detail line within them also has a further Audit number, also knowns as Audit (Detail). These Audit numbers are applied when the Transaction is saved.
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However, the numbers may not be strictly sequential. Where Batched Transactions are involved, Detail lines or even the whole Transaction may be deleted, and this will result in gaps in the Audit number sequence.