Purpose
When a project is being processed, expenditures and costs that affect revenues are incurred on the project. It is of particular importance for the project manager to plan and monitor the payment flow from a project point of view for long term projects, which require intensive capital. You use Project Cash Management for this project-related view of the payment flow.
For more information, see the SAP Library standard documentation, under Logistics ® Project System ® Payments.

The individual steps are normally processed by different employees in their current activities. To explain the process, the steps in this example are listed one after another, and then are all evaluated in reporting.
The following particularly concentrates on monitoring customer payments. The payment update on the credit-side is made when you post the corresponding business transactions during order processing.
Prerequisites
You need to activate Project Cash Management for controlling area 4000.
Process Flow
Customer Payments
You already created the billing plan during order processing. The system created dates for the sales order using milestone billing:
See
You confirmed the Acceptance Basic Engineering activity during order processing. A billing milestone is assigned to the activity for a down payment. When you make the confirmation, the system automatically unlocks the billing date, so you can
create a down payment request.These steps are not relevant for the example process. You can process it in the same way as the partial invoice. To unlock the billing date for the second partial invoice, confirm the Follow-up Assembly activity. To do so for the final invoice, confirm the Final Acceptance business transaction.