The blue line for Posted in Billing Schedule Client is only filled in when the outgoing invoices are linked to the billing schedule. If it shows zero, the invoices are not linked. Go to Invoice → Outgoing invoice and link the instalment invoices to the billing schedule, and any change order invoices to the correct Change Order Client.
How to fix it
Go to Invoice and the Outgoing invoice tab.
Show the invoices that are not linked.
Click Link on an instalment invoice and select the correct line in the billing schedule.
Link invoices for change work to the correct Change Order Client.
Go back to Billing Schedule Client. Posted is now shown in the chart and table.
The colours in the chart
Green: produced value (production value)
Red: what is invoiced (invoice amount)
Yellow: withheld amount
Blue: what has actually been posted
Good to know
When the invoices are linked to the schedule, the liquidity picture also becomes correct, because the invoices are placed on the instalments.
To see accumulated cash flow, i.e. incoming minus outgoing payments for the whole project, use Liquidity, not the billing schedule.

