Issue
When editing and saving a Sales Order, the following error was thrown:

To resolve the issue, follow these steps to ensure the Item Fulfillment record is properly updated and the Sales Order can be edited or saved without errors:
- Navigate to Transactions > Sales > Fulfill Orders page.
- Click the Fulfill link beside the relevant Sales Order (e.g., Sales Order xxx).
- On the Item Fulfillment record, assign the serial/lot number for the item (e.g., Item xxx).
- Set the Status to Packed.
- Click Save.
- Navigate to Transactions > Sales > Fulfill Orders > Lists.
- Click the View link next to the relevant Item Fulfillment record.
- Click the Mark Shipped button.
- Return to the Sales Order that needs to be updated.
- Click Edit and Save.
For Sales Order SO-UK-02979, it was observed that an Item Fulfillment record had already been created and was in the Packed status. To resolve the issue, simply:
- Navigate to Transactions > Sales > Fulfill Orders > Lists.
- Click the View link next to the Item Fulfillment record for SO-UK-02979.
- Click the Mark Shipped button.
- Return to the Sales Order, click Edit, and Save.