public interface DbEnum<T> {
	T getDbValue();
}

@Mapper
public abstract class MyMapper {

	public enum CheeseType implements DbEnum<Integer> {
		BRIE(1),
		ROQUEFORT(2);

		private final Integer dbValue;

		CheeseType(Integer dbValue) {
			this.dbValue = dbValue;
		}

		@Override
		public Integer getDbValue() {
			return dbValue;
		}
	}

	public enum OtherCheeseType {
		BRIE,
		ROQUEFORT
	}

	// Here IDEA shows a warning: Unmapped target property: dbValue 
	public abstract CheeseType map(OtherCheeseType cheese);
}