When seeing the error message
"Voucher CEU-000001 is already used as of date 31.12.2014."
(sequence number and date can vary) it is based on duplicate number sequences.
In my case it appeared when posting a sales invoice.
The number sequence for
Sales order - free text invoice was set up with the same format as the number sequence for
Sales order - invoice.
To fix the number sequences, I went to
Accounts receivable\Setup\Accounts receivable parameters\Number sequences and changed the format of one of those two number sequences to make it unique:
So always set up transactional related number sequences with an unique format!
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