In terms of best practice and performance you could also create a line item to add some of the values together before using in the IF statement.
You could also make a system module for Package and calculate the booleans once there.
Create an intermediate line item:
X= IF SYS Package.Purchase Order Type OR SYS Package. Subcontractor Type THEN B1 + B2 + B3 + B5 + B6 ELSE 0
The system module would replace the use of Type line item in your module
Then your line item would be:
IF SYS Package.Purchase Order Type THEN X + B4 ELSE IF SYS Package. Subcontractor Type THEN X ELSE 0
The principles here are to do as few calculations as possible, part of this is achieved by using a System module; the naming convention should be clear so future developers will understand where to look for properties relating to that list.
