STEP 1
Go to Invoices -> Issue new invoices
STEP 2
Select from filters:
Issue invoice for and choose Expenses (if you want to bill the expenses according to the billing method selected on the contract) or
Expenses by contract (if you want to bill the expenses on all the projects in the contract, regardless of the billing rule or method)
Date from/Date until - select an interval that includes the expense date that you want to bill
Exchange date - the date on which the invoice is issued and for which the exchange rate applies
STEP 3
Click the Apply button and the system will display a list with the expenses you want to bill according to the criteria selected
STEP 4
Click on the arrow next to the client/project you want to bill.
STEP 5
Go to Invoices -> Edit the invoice, if necessary
STEP 6
Click on Save and then on Actions -> Validate