Line Pricing Strategy Assignment- Required Setups

Summary:

Hi, we have a requirement to apply both header & Line pricing strategy assignments. The intention is to have the Header strategy as a generic one and the line strategy take precedence in applying the price. When the Line strategy does not have a valid price for a selected item, then the header strategy will default the price. For this purpose, we are configuring the pricing strategy assignment with the assignment basis = Line. However, It is not working as expected, and trying to find any details about these configuration steps in the implementation manual, but I haven't seen anything.