On the Create Batch Invoice screen, you have to make sure to enter 100 in the % Complete column. Based on the revised % Complete, CORE prompts you to recalculate the Net Bill for this project. Click Yes. As you have modified the % Complete field, CORE again prompts you to copy the revised % Complete value to the associated project profile. You can click Yes again. Now the project status is marked as Complete.
Note: This only works with project type with a contract amount, e.g., fixed, hourly not to exceed, etc.