An invoice is created to track billable amounts due from a client. The invoices (billable amounts) generated in PSA can then be exported to an organization’s accounting software. The invoices also support multiple currencies to allow clients to be billed in the required currency.
The PSA Invoice module takes into consideration the billing rate, hours entered by users, taxes and other factors to calculate the total of an invoice for a given period of time. PSA uses invoice workflows to track invoices in an organization. In an organization, a sequence of steps are carried out before an invoice is sent to a client; for example, an invoice can be sent from one department or manager to another for approval before it is sent to the client. Therefore, invoice workflows are created to ensure the invoice approval process is carried out sequentially.
The global settings for the invoices must be set before the invoices can be created, generated or posted. The Invoice tab accessed through Setup > Financial > System allows you to set up the invoice templates and the rules that apply to all invoices being posted; for example, rules can be set to prevent users from posting invoices with open Timesheet or Expense periods, unapproved time entries and unlocked days in the invoice interval.
These articles will guide you through the process of configuring the global settings for invoices: