Scenario
The Project field on the Sales Order item lines appears to be uneditable.
Solution
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Navigate to Setup > Company > Enable Features
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Under the Transactions tab, tick the 'Charge-Based Billing' box
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Click Save
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Navigate to Customization > Forms > Transaction Forms
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Click Edit on your preferred custom form
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Under the Sublist Fields tab, tick the 'Charge Type' box
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Click Save
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Open the sales order with the Project field greyed out
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Ensure that the form you edited is currently selected under the Custom Form field
NOTE: The Project field is already editable upon refresh of the page since the 'Charge Type' field has been exposed. However, the 'Charge Type' field should not be populated. If populated, it will make the Project field greyed out again.