Create external service products #700
Description
User Story:
As a project manager, I want to create external service products, so that I can make that transparent to the customer, that this service item is performed by an external partner.
Acceptance criteria:
1.) The user of the app can create a new type of service products, that reflect external services.
2.) Taxes are always displayed and accounted for this package type on the offer printout, even if the customer is an internal customer
3.) These taxes are accounted explicitly on the offer printout