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You can change commitment details after you enter them by creating a change order, which updates the commitment information and creates a record of changes to the order. For example, to increase the committed amount for an order by 100, you enter a change order for 100.
In the processing options for the Purchase Orders program (P4310), ensure that the Processing Option in the Defaults section for line sequencing is set to 0. If this Processing Option is set to 1, you will have difficulty receiving change orders.