Hi @Fabienne35
based on this answer Ranking previously collected list of names - #8 by LN
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Download the form I prepared: barcodes.xlsx (6.2 KB)
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Convert it to xml using http://opendatakit.org/xlsform/
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Add:
<itemset nodeset="/barcodes/group">
<value ref="c1"/>
<label ref="code"/>
</itemset>
instead of:
<item>
<label>A</label>
<value>a</value>
</item>
in line 38 under
<label>Select barcodes</label>
Here is the result: barcodes.xml (1.6 KB)