I or D against my batched Sales Order

The 'I' against the sales order is to indicate visually that the Invoice has been printed but has not been updated. To process it through to the customer record, flag the order as yes and on next window, ensure that the Update Invoice box is ticked.
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If there is a 'D' against the order it similarly means that a Delivery Note has been printed but not updated.
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For information on how to clear these status flags, please see our article on clearing the status flags