Having a problem using an update cursor to add values to a field in a feature class that is in a feature dataset and has topology. This code always works outside of a feature dataset and sometimes works inside a feature dataset without topology.
UPDATE_FIELD = [error_field] + KEY_FIELD
with arcpy.da.UpdateCursor (features, UPDATE_FIELD) as cursor:
for row in cursor:
key = tuple (row [1:])
if key in error:
row  = error [key]
Any help would be appreciated.