Tracking AP invoices as assets

Here is our Scenario

1) Invoices are charged to capital project A task 1.

2) Project A is a capital project and there is capital asset attached to the task

3) Since the project and task is capitalizable and it is charged to asset account all invoices comes to PA as capitalizable without user selecting the option "Track as Asset"

4) The issue is that there are cases where the invoice is an expense item and user don't want to capitalize that invoice. But there is no option on invoice line to mark to not to capitalize. It is a check box and cannot be used in this case. Was wondering if it was an option where user can say NO capitalize or NO to track as asset it would just come to project but as NOT capitalizable.