Excerpts from abrazier's message of 2019-02-28 15:50:51 -0700:
While editing items that are being added to our collection, when we click in the field (p - Piece designation (barcode)) which we have always had set to (autoBarcode: generated in the form 1, 2, 3) we are no longer getting the barcode we expect to see.
We suspect it is now going back to barcodes that once belonged to items that are now deleted (because, that earlier barcode is now available).
I took a look at the Koha source code, and it seems that for some barcode types, it is using this SQL to determine where to start generating new barcodes: select max(abs(barcode)) from items; It then increments the value that it obtains this way to use as the new barcode. So I suspect that you could fix your problem by creating a dummy item that has the first barcode you want to use, minus one. Note that I am not an expert and have not tried this myself.