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Serial numbering of idno seems broken


I have a setup that should assign a unique idno number with each imported image.

The multipart_id_numbering .comf is set up as following (only the relevant part)
formats = {
ca_objects = {
image = {
separator =,
elements = {
object_number = {
type = SERIAL,
minimum_value = 102000,
width = 6,
description = _(Object number),
editable = 1,
table = ca_objects,
field = idno,
sort_field = idno_sort

    __default__ = {
        separator =,

        elements = {
            accession_number = {
                type = FREE,
                width = 30,
                editable = 1,

                description = _(Accession number)


It seems to work fine for a while but then the numering starts to loop again and i end up with multiple Idnos that are the same.
Any ide why?
How is the next IDNO calculated and where?


  • I don't know why this is happening in your case. but there were definitely issues with the numbering system (esp. when used with multiple elements that mixes letters and numbers) that would result in duplicate numbers being issued. Updating to current code will get you these fixes. You also should run "rebuild sort values" under "Maintenance" in the "Administrate" area and see if that helps. The next value in generated by looking at what the last used value is, which in turn relies upon sort operating properly.

  • Thank you for you anwser! Will try to "rebuild sort values" and get back to you.

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