I have added a custom field to the edit layout of the Order Product object, which appears after I click on Add Products button on the Order record page, in the Order products-related list. But I am not sure why, that field is showing as locked in the page layout popup, and is not editable.
I checked the field accessibility settings and it is editable there for my profile. And I even checked the field level security and confirmed that it is not marked as read-only.
I am adding the image of the same below, can someone please let me know why this field is showing as locked and is not editable in the edit layout.