We are unable to find the attachment for the invoice having attachment in the VendShowspecifikation.For further details, please refer as below: 

1.Post vendor invoice with attachment 

2. Create a payment to settle open invoice-> view marked transactions

-> Unable to find any attachment

Business justification: The end goal is to have the approver to view attachment (eg: scanned copy of vendor invoice) during vendor payment disbursement workflow approval process. So, they can validate vendor payment against copy of invoices that have been attached to the invoice form (when the invoice was firstly created by AP officer).