Updates the passed field value for the given routeStepId

---
### Parameters
**routeStepId** `Integer`<br />
**field** `String`: Name of column<br />
**value** `pyObject`: Datatype of referenced field<br />
**userId** `Integer`: Id of user executing the function<br />

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

---
### Example
```python
# Change the step number
recordsModified, msg = system.kanoa.lot.updateRouteStepField(5001, "stepNum", 4, 123)

# Disable a route step
recordsModified, msg = system.kanoa.lot.updateRouteStepField(5002, "enabled", False, 123)

# Update the step description
recordsModified, msg = system.kanoa.lot.updateRouteStepField(5003, "stepDescription", "Final inspection before packaging", 123)
```