[Koha] autoBarcode not incrementing

[WTC]

Hello
I am in the process of adding new books to Koha for the first time. I've
added all the MARC records, and now I'm adding the items.
I keep getting Error saving item: Barcode must be unique
The autoBarcode is set to <branchcode>yymm0001 so I expect it to increment,
but it keeps generating the same barcode number for each item.
Any help please?

These messages are being generated in the logs. Not sure if connected.
zebraidx(2435) [warn] Index 'Record-control-number' not found in attset(s)


Koha version:	3.02.07.000
OS version ('uname -a'):	Linux Koha 2.6.32-5-amd64 #1 SMP Wed Jan 12
03:40:32 UTC 2011 x86_64 GNU/Linux
MySQL version:	mysql Ver 14.14 Distrib 5.1.49, for debian-linux-gnu (x86_64)
using readline 6.1
Apache version:	Server version: Apache/2.2.16 (Debian)
Zebra version:	Zebra 2.0.44 (C) 1994-2010

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