The application does not offer a bulk change of the numbering series on documents that have already been created. You have two options for achieving this result.
Manually in the application
Internal numbers can be overwritten on each document individually. First, you need to enable this feature — you can find the steps in the article about overwriting internal numbers. For a larger number of documents, this approach is time-consuming.
Via REST API
A faster approach is the REST API. You identify the document by its id and write the new internal number into the kod element:
<winstrom version="1.0">
<faktura-vydana>
<id>10</id>
<kod>VF0125/2026</kod>
</faktura-vydana>
</winstrom>
⚠️ Even for writing via the API, manual overwriting of internal numbers must be enabled in the company settings. Test this operation on a test copy of your data first — renumbering documents is irreversible.
💡 Don't have experience with the API and dealing with a large volume of documents? We can prepare a custom renumbering solution for you — just write to podporaflexi@abra.eu.