A reimbursable expense is always under the name of the freelancer and is included in the accounting as both an expense and an income so that the result is 0.
Example: A flight to provide a service to your customer. The flight is purchased (€50 + VAT) and the expense is recorded on the books when issuing the invoice to the client and the taxes are included (VAT and personal income tax, if applicable).
How should it be recorded in the books?
If the purchase invoice is under your client’s name
Include the necessary rows as expenses covered
Don't upload the purchase invoice because it isn't under your name
If the purchase invoice is under your name
You need to include them in your invoice issued but the category has to be "Professional service"
You have to upload the expenses in your accounting