It is not possible to assign supplier accounts, categories or vat codes to invoices/receipts through the phone app. In order to make the app as easy to use for non accountants/bookkeepers, the app is designed only for snapping images of your purchase invoices/receipts and uploading them to your account. 

The coding of your invoices and publishing them through to your accounting software would be done in your account through the main website.

If you use tracking categories in your accounting software then you can select a tracking category from the app before uploading the image.

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