# system.kanoa.inventory.updateUnitOfMeasureField(uomId, field, value, userId)

Updates a single named field on an existing unit of measure (UOM) record identified by `uomId`. 
Only one column � either `uomCode` or `uomName` � may be targeted per call, so changing both attributes on the same UOM requires two calls to this function. 
The update is attributed to the user identified by `userId` for audit-trail purposes, and the call reports back how many records were actually modified.

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### Parameters
**uomId** `Integer`: Id of unit of measure to update<br />
**field** `String`: Valid options are uomCode, uomName<br />
**value** `String`: Value to update to<br />
**userId** `Integer`:Id of the user executing the function<br />

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### Returns
**# of records modified** `Integer`<br />
**message** `String` None if success<br />

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### Example
```python
uomId = 14
field = 'uomName'
value = 'Kilogram'
userId = system.kanoa.security.getIDPUserId({'userName': 'SYSTEM'})

recordsModified, message = system.kanoa.inventory.updateUnitOfMeasureField(uomId, field, value, userId)
print recordsModified, message
```