Open the 
Service Order window.
Browse to the relevant service order.
Click Posting, Post. If you want to print the order at the same time as you post, click Posting, Post and Print instead.
Confirm the subsequent message.
When you have created a service order, filled in all the necessary information and made any modifications, you can post the service order. The service order must contain at least one service item line and one service invoice line before you can post the service order.
Open the Service Order window.
Browse to the relevant service order.
Click Posting, Post. If you want to print the order at the same time as you post, click Posting, Post and Print instead.
Confirm the subsequent message.
A window shows the status of the posting process.
When the posting is completed, the program creates a posted service order and an unposted or posted sales invoice, depending on the default invoice document.
Checking Service Orders before Posting Them