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You can go go Administration → System Settings → Auto Numbering → Invoice which allows you to change the initial number for better reference so you can identify which invoice is done in Ascora moving forward.
Jump In Allocated Numbers
Each mobile app will be pre-allocated 25 numbers whether it's invoice number, job number, or quote number. This is to make sure that a mobile app user is able to create a job, create an invoice, or create a quote even without mobile coverage as Ascora supports offline mode.
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