Therefore, before submitting potential tenders, the contract agent should draw their attention to the possible need to revise their accounting procedures in order to meet the requirements of the order accounting clause of the changes in 52.243-6. (b) The following categories of direct costs are generally separated and liable in accordance with the provisions of the exchange order clause: (1) One-off costs (e.g. B engineering costs and costs of obsolete or recreated work). (2) cost of additional work resulting from the modification contract (e.g. B new subcontracting work, new prototypes or new update or backfit kits). (3) Cost of recurring work (e.g.B. cost of labour and materials). 43.204 Administration. (a) modification of the contract documentation. If the change orders are not completed, they need two documents: the change mandate and an addendum reflecting the resulting fair adjustment in the terms of the contract. . .