Survey costs invoice attachment

As an operator or accounting manager I need to be able to upload the original invoice from vendor when generating an invoice in IMOS in the Bunker Survey costs module.
Today, there is no "attachment" button so the underlying invoice cannot be attached to the Invoice. This is however possible for "Other rev/exp" type of costs.

To not being able to see the underlying invoice when approving og posting the invoice is a dealbreaker for us as the person in charge cannot verify the validity of the invoice (without finding the underlying elsewhere, which is not a viable option)

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