--- title: Why am I seeing duplicates? description: Explains how duplicates arise, what quarantine means for the original, and how to have duplicates stopped before they reach your ERP system. --- [Skip to content](https://knowledge.qvalia.com/duplicate-invoices#main-content) - [English](https://knowledge.qvalia.com/duplicate-invoices) - [Svenska](https://knowledge.qvalia.com/sv/varfor-ser-jag-dubbletter) English Show submenu for translations [Submit a ticket](https://knowledge.qvalia.com/kb-tickets/new?hsLang=en) [Customer portal](https://servicedesk.qvalia.com/tickets?hsLang=en) ![Qvalia Logo New Blue transparent.png\]](https://knowledge.qvalia.com/hs-fs/hubfs/Qvalia%20Logo%20New%20Blue%20transparent.png?height=24&name=Qvalia%20Logo%20New%20Blue%20transparent.png) Open main navigation Close main navigation - - [English](https://knowledge.qvalia.com/duplicate-invoices) - [Svenska](https://knowledge.qvalia.com/sv/varfor-ser-jag-dubbletter) English Show submenu for translations - [Submit a ticket](https://knowledge.qvalia.com/kb-tickets/new) - [Customer portal](https://servicedesk.qvalia.com/tickets) How can we help you? - There are no suggestions because the search field is empty. 1. [Knowledge base](https://knowledge.qvalia.com/?hsLang=en) 2. [Invoice management](https://knowledge.qvalia.com/invoice-management?hsLang=en) # Why am I seeing duplicates? ## Qvalia compares the sender's company registration number, invoice number, total amount and invoice date to identify duplicates. How a duplicate is handled depends on the account settings and whether the invoice is incoming or outgoing. - Duplicate control is included and matches on the sender's company registration number, invoice number, total amount and invoice date. - An incoming duplicate is normally stopped in **quarantine**, where you choose which invoice to use. The original has already been delivered. - An outgoing duplicate normally receives a note in the invoice timeline instead of being stopped. - The handling can be configured differently for your account. The invoice timeline and the actions shown in quarantine tell you what actually happened. - If you see duplicates that do not appear in the transaction log, they did not come through Qvalia but through another inbound flow at your end. ### How duplicates arise Cause What happened What you do Resends from both sides The same invoice is resent from more than one source. Keep one of each and agree who is responsible for any new transmission. The supplier sends more than once The sender resends the same invoice. Check which invoice should be used and resolve the duplicate using the available actions. A separate inbound flow at your end The invoices did not come through Qvalia at all but arrived by another route. Check whether you have a parallel flow for incoming invoices. If the invoices are not in the transaction log, they did not come from Qvalia. ### Duplicates in quarantine Duplicates end up in the quarantine view in the web interface. What matters: - **Under the normal incoming handling, the original has been delivered.** Later copies in quarantine do not then mean the original invoice was stopped. - **Content in quarantine does not move on** until you perform an available resolution action. - **Choose the correct invoice.** In the resolution view, choose which invoice to use. The other invoice is archived. Quarantine also holds documents that could not be scanned as invoices. Those carry the quarantine reason `Low quality` and are a different matter from duplicates: see the article on invoices that have not arrived. ### How a duplicate is identified Duplicate control compares four details: the sender's company registration number, invoice number, total amount and invoice date. Review the invoices before choosing the original, as incorrect or incomplete sender details can produce a misleading match. The handling is governed by the account configuration. Contact support if incoming or outgoing duplicates should be handled differently for your account. If an older invoice has been replaced, it is no longer shown in the list. If you need it, contact support with the invoice number, sender and invoice date. We will investigate what can be done, but we cannot guarantee that a replaced invoice can be retrieved afterwards. ### Duplicates from resends If an invoice is to be resent after a correction, agree who does the resending. The documented main cause of large duplicate volumes is that Qvalia reran a batch after a fix while the customer resent the same invoices, with no check of one batch against the other. Before you resend: ask support whether the invoices are already included in a rerun. ### If it still does not work - **Check once more:** whether the duplicates appear in the transaction log, which invoice should be used and which actions are shown in quarantine or the timeline. - **Have this ready when you contact support:** roughly how many duplicates are involved, a couple of invoice numbers as examples, which sender they come from, the dates they arrived, and whether you have resent invoices yourselves during that period. - **Contact support:** through the support form at the bottom of https://qvalia.com or at help@qvalia.com. - [General](https://knowledge.qvalia.com/general?hsLang=en#main-content) - [Peppol](https://knowledge.qvalia.com/general?hsLang=en#peppol) - [Partner](https://knowledge.qvalia.com/partner?hsLang=en) - [Logs and monitoring](https://knowledge.qvalia.com/logs-and-monitoring?hsLang=en) - [Integrations](https://knowledge.qvalia.com/integrations?hsLang=en) - [Invoice management](https://knowledge.qvalia.com/invoice-management?hsLang=en) - [Order management](https://knowledge.qvalia.com/order-management?hsLang=en) - [Data management](https://knowledge.qvalia.com/data-management?hsLang=en) - [Security and compliance](https://knowledge.qvalia.com/security-and-compliance?hsLang=en) - [Account](https://knowledge.qvalia.com/account?hsLang=en) - [Troubleshooting](https://knowledge.qvalia.com/troubleshooting?hsLang=en) [![Chill listening crop-3](https://knowledge.qvalia.com/hs-fs/hubfs/Qvalia%20Logo%20New%20Blue%20transparent.png?width=107&height=24&name=Qvalia%20Logo%20New%20Blue%20transparent.png "Chill listening crop-3")](https://qvalia.com/) Knowledge base Copyright © 2025, Qvalia