(v1) .Approving the Bill v2018.1

After a Bill is generated, it has a status of Complete. It can be Approved by clicking the 'Approve/Unapprove' button on the Bills grid. Approving the Bill allows it to be seen on CustomerCenter. Additionally, the Approval process updates all the Invoices generated on that Bill from status Pending to Billed. Once Approved, the Bill can be Unapproved to remove it from CustomerCenter. However, this DOES NOT change the Billed Invoices back to Pending. 

In addition to setting the Billed status on all the Invoices, the Approval process sets the specified date as Invoice Date on every Invoice.  The Due Date is also set using the BILL_INVOICE_DUEDAYS config option. This option specifies the number of days after the Invoice Date that each Invoice is Due. The default setting for this config option is 30 days.