Can the bill number be changed once it is posted to the ledger?

Wrong bill numbers are caused when cashiers manually enter a bill number when doing an SIB bill posting.
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​Bill numbers cannot be changed.
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If the bill number is wrong it needs to be reversed and reposted.
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If the bill has been allocated to a transfer (TCO) or a receipt (BRO) you have to reverse the transfer, reverse the bill, then repost the bill with the new number and repost the transfer.
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Proclaim has Auto bill number feature that can be switched on.
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For further details search for the help article Proclaim Auto Bill Option.