The accounting can and should be handled by the system. The system distinguishes between invoices and credit notes.
To create an account, select the menu item invoices from the invoice recipient (advertiser) and the account type. Depending on the type of calculation several other fields are then available. Please note: All invoices are numbered. If you delete an account from the system is missing at this point an invoice number and there may be problems with the tax office. For this reason it is advisable to delete invoices only if this is the last currently standing in the list bill, so the next invoice generated can be continued with a sequential number. In all other cases, the bills should not be deleted but only overwritten. (It is important to ensure that the invoice number and date for the tax office must be consecutive.)
Keywords: bill, credit, customer, vat