Project Work Type for Requisition Approval

Hi,

We were wanting to use Project Work Type for our requisition approval. I see where we can use this field within the requisition distribution for the workflow, but not from the project module.

My confusion on this is on the requisition, when you select a project, the expenditure type from the LoV are the ones that are available for that specific project. But you are able to select any type of project work type for that specific project even if within the project module for that project, there is a specific project work type already selected. Why doesn't the project work type follow the lead to the project that is selected for that requisition?