Why can't I associate a billable task with a contract line?

You can either associate a project and task to a contract line, or a project without any tasks to a contract line.

If you associate a project without any tasks to a contract line, any future associations of that project to another contract line cannot include a task.

If you associate a project and task to a contract line, you can perform the following actions for future associations: Associate the same project and task to another contract line Associate a task in another branch of the same project hierarchy to the same or another contract line. For example, if you associate Project 1, Task 1 to Contract A, Line 1, you can associate in Project 1, Task 2.2.1 to Contract A, Lines 1 and 2, and also Contract B, Line 1.

To select a task from another level in the same branch of the task hierarchy, you must first inactivate the existing associated project and task. In the example, before you can associate Project 1, Task 1.1 to Contract A, Line 1, you must inactivate the existing association between Project 1, Task 1 and Contract A, Line 1.