Why am I unable to assign capitalizable costs associated with a project task to an asset?

You're typically unable to assign capitalizable costs associated with a project task to an asset when there are no project assets assigned to that project task.

Ensure that there are project assets assigned to the tasks to which you plan to charge project costs. These assets must have the project asset type of As-built.

It's also a good idea to check whether the task to which the assets are assigned is capitalizable. You can do so in the Manage Financial Project Plan page associated with the project. Select the task and click Actions > Manage Tasks > Edit Task Details > Setup to check whether the Capitalizable check box is selected.