For companies integrated with Sage Business Cloud Accounting (SBCA), the AutoEntry 'Invoice Number' maps to the SBCA 'Reference' field.

SBCA does not have a specifically-labeled 'invoice number' field for purchase invoices - they simply use the 'Reference' field. This field also has the advantage of displaying "by default" in the SBCA 'Purchase Invoices' view (as opposed to the 'Supplier Reference' field which does not):

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