How to charge the customer for the purchase made on behalf of them?

Question
We are trying to work out the correct way of recording purchasing information in Changepoint for invoicing on to the client later. When our company incurs some expense or makes a purchase on behalf of a client and in relation to a project, which is the best way to keep track of that in Changepoint?

Resolution
If there is also a need to keep track of the cost in addition to invoicing, i.e. to create a budget and compare the budget v.s. actual, then it is better to create a product so that the customer can be invoiced, and then create a material record that allows entering costs associated to the product.

If the aim is only invoicing the customer for the purchase, a fixed fee can be created for this purpose. There is no need to enter a product/material.