7.3 Changing prices: dealing with InvoIcing errors o In this section we have an integrated activity which involves billing and invoicing. It includes a number of complications. the first step involves completing the invoice according to the price list given and the information contained in the customer file. The second step, the role-play, then introduces numerous complications in the form of additional information and snags In all there are four pieces of information which are listed below in step B for clarification purposes7.3 Changing prices: Dealing with invoicing errors ⚫ In this section we have an integrated activity which involves billing and invoicing. It includes a number of complications. The first step involves completing the invoice according to the price list given and the information contained in the customer file. The second step, the role-play, then introduces numerous complications in the form of additional information and snags. In all there are four pieces of information which are listed below in step B for clarification purposes