The PATCH method is used for updating item properties.
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When updating a property that is part of another property, both properties are updated; for example, the TagSequenceNo property of a pipe run is included in the ItemTag property, therefore, when the pipe run's TagSequenceNo property is updated, its ItemTag property is updated automatically.
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PATCH requests cannot be used to update properties that are read-only in the UI, including SI value properties, for example: VolumeRatingSiValue.