Expose AP Subaccount in API

[Eirik Morken - Proplan AS]

Greetings 😁

We would like to expose the AP Subaccount field (APInvoice.APSubID) under "Financial Details" in "Bills and Adjustments" (AP301000) in the SupplierInvoice endpoints /controller/api/v1/supplierInvoice/{invoiceNumber}  

This field is being used to route invoices to the correct approver in Approval and it is therefore crucial for us to the able to access this field to prevent a lot of manual processes for our customer.

This field is not available in the Supplier endpoints either so we are not able to "cheat" the field into having the desired value by resetting the supplier in the invoice.