The Cost Collection Flexfield is a descriptive flexfield that captures additional information about project costs. It has three core attributes that are required for every cost transaction: Billable Flag, Expenditure Type, and Capitalizable Flag. These attributes can be derived during import if not explicitly entered in a transaction document, based on various rules and sources such as expenditure type defaults, project type defaults, transaction source defaults, etc. Funding Source and Work Type are not core attributes of the Cost Collection Flexfield, but context-sensitive segments that can be optionally enabled for certain transaction sources or business units. These segments capture additional information about how the costs are funded or what type of work is performed. Reference: https://docs.oracle.com/en/cloud/saas/project-portfolio-management/20c/oapfm/manage-project-costs.html#OAPFM2356141