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When working with Geodatabase data, ArcMap's 'Unique values' symbology method does not work properly when the value field has different coded-domains defined for each subtype. The following may happen:
ArcMap’s 'Unique values layer' symbology method does not work properly if the value field has different coded domains defined for each subtype. In this scenario, ArcMap works with the coded domain descriptions from the first subtype for all features. In other words, regardless of which subtype the feature belongs to, the description will be read from the coded domain definition for the first subtype. Features will also be symbolized according to the first coded-domain definition.
Note: Keep in mind the 'Unique values, many fields' method generates symbology based on all the unique combinations of the first and second value fields. Consequently, if some subtypes in your data share a coded domain, you will need to aggregate some of the generated classes to obtain a list of unique coded domain values.