Reproducal for #2421

processor/src/test/java/org/mapstruct/ap/test/bugs/_2421/Company.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._2421;
+
+public class Company {
+
+    private String name;
+
+    private CompanyType companyType;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public CompanyType getCompanyType() {
+        return companyType;
+    }
+
+    public void setCompanyType(CompanyType companyType) {
+        this.companyType = companyType;
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_2421/CompanyDto.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._2421;
+
+public class CompanyDto {
+    private String name;
+    private String companyType;
+    private String companyTypeLatinTitle;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getCompanyType() {
+        return companyType;
+    }
+
+    public void setCompanyType(String companyType) {
+        this.companyType = companyType;
+    }
+
+    public String getCompanyTypeLatinTitle() {
+        return companyTypeLatinTitle;
+    }
+
+    public void setCompanyTypeLatinTitle(String companyTypeLatinTitle) {
+        this.companyTypeLatinTitle = companyTypeLatinTitle;
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_2421/CompanyMapper.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._2421;
+
+import org.mapstruct.InheritInverseConfiguration;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+import org.mapstruct.factory.Mappers;
+
+@Mapper
+public interface CompanyMapper {
+    CompanyMapper INSTANCE = Mappers.getMapper( CompanyMapper.class );
+
+    @Mapping(target = "companyTypeLatinTitle", source = "companyType.latinTitle")
+    CompanyDto toDto(Company entity);
+
+    @InheritInverseConfiguration
+    @Mapping( target = "companyType", source =  "companyType")
+    Company toEntity(CompanyDto dto);
+
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_2421/CompanyType.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright MapStruct Authors.
+ *
+ * Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
+ */
+package org.mapstruct.ap.test.bugs._2421;
+
+public enum CompanyType {
+    insurance("Insurance", "insurance"),
+    inspection("Inspection", "inspectionem"),
+    Shipping("Shipping", "naviportans");
+
+    private final String title;
+    private final String latinTitle;
+
+    CompanyType(String title, String latinTitle) {
+        this.title = title;
+        this.latinTitle = latinTitle;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public String getLatinTitle() {
+        return latinTitle;
+    }
+}

processor/src/test/java/org/mapstruct/ap/test/bugs/_2421/Issue2421Test.java

@@ -0,0 +1,38 @@
+package org.mapstruct.ap.test.bugs._2421;
+
+import org.mapstruct.ap.testutil.IssueKey;
+import org.mapstruct.ap.testutil.ProcessorTest;
+import org.mapstruct.ap.testutil.WithClasses;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Filip Hrisafov
+ */
+@IssueKey("2421")
+@WithClasses({
+    Company.class,
+    CompanyDto.class,
+    CompanyMapper.class,
+    CompanyType.class
+})
+public class Issue2421Test {
+
+    @ProcessorTest
+    public void shouldGenerateValidCode() {
+        Company entity = new Company();
+        entity.setName( "Test" );
+        entity.setCompanyType( CompanyType.inspection );
+
+        CompanyDto dto = CompanyMapper.INSTANCE.toDto( entity );
+
+        assertThat( dto.getName() ).isEqualTo( "Test" );
+        assertThat( dto.getCompanyType() ).isEqualTo( "inspection" );
+        assertThat( dto.getCompanyTypeLatinTitle() ).isEqualTo( "inspectionem" );
+
+        entity = CompanyMapper.INSTANCE.toEntity( dto );
+
+        assertThat( entity.getName() ).isEqualTo( "Test" );
+        assertThat( entity.getCompanyType() ).isEqualTo( CompanyType.inspection );
+    }
+}