Update Items box missing on Sales Order

The Update Items box is missing on one particular Sales Order. What’s the fix for this? Thank you

Check whether any transactions created against the sales order?

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Having same issue. Only invoice (transaction) is done.
but sales order is not yet completed still some items need to be delivered.
Unable to figure out the issue.

Found solution. It is because %delivered (in more info) is 99.99%.
Once you reduce the %delivered less than 99% Update items button reappears.
Its a software bug.