Check a unit of measure's origin
- Last UpdatedMay 21, 2025
- 1 minute read
- PI System
- PI Server 2024 R2
- PI Server
Beginning with PI AF 2017 R2, you can check the origin of a UOM definition in the UOM database. The Origin field is included in the Unit of Measure Properties window, as well as the UOM viewer. It is also supported in PI Builder.
Possible values shown in the Origin column are:
|
Origin |
Description |
|---|---|
|
Unknown |
The origin of how the UOM was defined is unknown. |
|
System Defined |
The UOM is system-defined and has not been modified. Note: If only a UOM mapping is changed, Origin remains set to System Defined. |
|
System Modified |
The UOM was system-defined but the Name and/or Description fields have been modified. |
|
System Replaced |
The UOM retains its original system-defined abbreviation and canonical UOM values but other fields besides Name and Description have been modified. |
|
User Defined |
The UOM was created by the user. |
If a UOM is modified that results in Origin being set to either System Modified or System Replaced, but is later reset to the original definition, Origin also reverts to System Defined.