diff --git a/processor/src/main/java/org/mapstruct/ap/model/source/Method.java b/processor/src/main/java/org/mapstruct/ap/model/source/Method.java
index 05736cf33..eece09af2 100644
--- a/processor/src/main/java/org/mapstruct/ap/model/source/Method.java
+++ b/processor/src/main/java/org/mapstruct/ap/model/source/Method.java
@@ -32,6 +32,10 @@ import org.mapstruct.ap.util.Strings;
 /**
  * Represents a mapping method with source and target type and the mappings between the properties of source and target
  * type.
+ * <p>
+ * A method can either be configured by itself or by another method for the inverse mapping direction (one of
+ * {@link #setMappings(Map)}, {@link #setIterableMapping(IterableMapping)} or {@link #setMapMapping(MapMapping)} will be
+ * called in this case).
  *
  * @author Gunnar Morling
  */
@@ -40,13 +44,14 @@ public class Method {
     private final Type declaringMapper;
     private final ExecutableElement executable;
     private final List<Parameter> parameters;
+    private final Parameter targetParameter;
     private final Type returnType;
 
     private Map<String, List<Mapping>> mappings;
     private IterableMapping iterableMapping;
     private MapMapping mapMapping;
 
-    private final Parameter targetParameter;
+    private boolean configuredByReverseMappingMethod = false;
 
     public static Method forMethodRequiringImplementation(ExecutableElement executable, List<Parameter> parameters,
                                                           Type returnType, Map<String, List<Mapping>> mappings,
@@ -150,6 +155,7 @@ public class Method {
 
     public void setMappings(Map<String, List<Mapping>> mappings) {
         this.mappings = mappings;
+        this.configuredByReverseMappingMethod = true;
     }
 
     public IterableMapping getIterableMapping() {
@@ -158,6 +164,7 @@ public class Method {
 
     public void setIterableMapping(IterableMapping iterableMapping) {
         this.iterableMapping = iterableMapping;
+        this.configuredByReverseMappingMethod = true;
     }
 
     public MapMapping getMapMapping() {
@@ -166,6 +173,7 @@ public class Method {
 
     public void setMapMapping(MapMapping mapMapping) {
         this.mapMapping = mapMapping;
+        this.configuredByReverseMappingMethod = true;
     }
 
     public boolean reverses(Method method) {
@@ -188,6 +196,15 @@ public class Method {
             && getResultType().isMapType();
     }
 
+    /**
+     * Whether this method is configured by itself or by the corresponding reverse mapping method.
+     *
+     * @return {@code true} if this method is configured by itself, {@code false} otherwise.
+     */
+    public boolean isConfiguredByReverseMappingMethod() {
+        return configuredByReverseMappingMethod;
+    }
+
     private boolean equals(Object o1, Object o2) {
         return ( o1 == null && o2 == null ) || ( o1 != null ) && o1.equals( o2 );
     }
diff --git a/processor/src/main/java/org/mapstruct/ap/processor/MapperCreationProcessor.java b/processor/src/main/java/org/mapstruct/ap/processor/MapperCreationProcessor.java
index 7297955e2..244655857 100644
--- a/processor/src/main/java/org/mapstruct/ap/processor/MapperCreationProcessor.java
+++ b/processor/src/main/java/org/mapstruct/ap/processor/MapperCreationProcessor.java
@@ -27,7 +27,6 @@ import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
-
 import javax.annotation.processing.Messager;
 import javax.lang.model.element.ExecutableElement;
 import javax.lang.model.element.TypeElement;
@@ -377,7 +376,7 @@ public class MapperCreationProcessor implements ModelElementProcessor<List<Metho
 
     private boolean hasSourceProperty(Method method, String propertyName) {
         for ( Parameter parameter : method.getSourceParameters() ) {
-            if ( hasProperty( parameter, propertyName ) ) {
+            if ( hasSourceProperty( parameter, propertyName ) ) {
                 return true;
             }
         }
@@ -385,20 +384,21 @@ public class MapperCreationProcessor implements ModelElementProcessor<List<Metho
         return false;
     }
 
-    private boolean hasProperty(Parameter parameter, String propertyName) {
+    private boolean hasSourceProperty(Parameter parameter, String propertyName) {
         TypeElement parameterTypeElement = parameter.getType().getTypeElement();
-        List<ExecutableElement> targetAccessors = filters.setterMethodsIn(
+        List<ExecutableElement> getters = filters.getterMethodsIn(
             elementUtils.getAllMembers( parameterTypeElement )
         );
-        targetAccessors.addAll(
-            filters.alternativeTargetAccessorMethodsIn(
-                elementUtils.getAllMembers( parameterTypeElement )
-            )
-        );
-        return executables.getPropertyNames( targetAccessors ).contains( propertyName );
+
+        return executables.getPropertyNames( getters ).contains( propertyName );
     }
 
     private boolean reportErrorIfMappedPropertiesDontExist(Method method) {
+        // only report errors if this method itself is configured
+        if ( method.isConfiguredByReverseMappingMethod() ) {
+            return true;
+        }
+
         TypeElement resultTypeElement = method.getResultType().getTypeElement();
         List<ExecutableElement> targetAccessors = filters.setterMethodsIn(
             elementUtils.getAllMembers( resultTypeElement )
@@ -431,7 +431,7 @@ public class MapperCreationProcessor implements ModelElementProcessor<List<Metho
                         foundUnmappedProperty = true;
                     }
                     else {
-                        if ( !hasProperty( sourceParameter, mappedProperty.getSourcePropertyName() ) ) {
+                        if ( !hasSourceProperty( sourceParameter, mappedProperty.getSourcePropertyName() ) ) {
                             messager.printMessage(
                                 Kind.ERROR,
                                 String.format(
diff --git a/processor/src/test/java/org/mapstruct/ap/test/oneway/OnewayTest.java b/processor/src/test/java/org/mapstruct/ap/test/oneway/OnewayTest.java
index a1637a4cf..40bffb382 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/oneway/OnewayTest.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/oneway/OnewayTest.java
@@ -55,4 +55,15 @@ public class OnewayTest extends MapperTestBase {
         assertThat( source ).isNotNull();
         assertThat( source.retrieveBar() ).isEqualTo( 23 );
     }
+
+    @Test
+    @IssueKey("104")
+    public void shouldMapMappedAttributeWithoutSetterInSourceType() {
+        Source source = new Source();
+
+        Target target = SourceTargetMapper.INSTANCE.sourceToTarget( source );
+
+        assertThat( target ).isNotNull();
+        assertThat( target.getQux() ).isEqualTo( 23L );
+    }
 }
diff --git a/processor/src/test/java/org/mapstruct/ap/test/oneway/Source.java b/processor/src/test/java/org/mapstruct/ap/test/oneway/Source.java
index 1f6d353d3..5a2c5fae5 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/oneway/Source.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/oneway/Source.java
@@ -20,8 +20,9 @@ package org.mapstruct.ap.test.oneway;
 
 public class Source {
 
-    private int foo = 42;
+    private final int foo = 42;
     private int bar;
+    private final long qax = 23L;
 
     public int getFoo() {
         return foo;
@@ -34,4 +35,8 @@ public class Source {
     public int retrieveBar() {
         return bar;
     }
+
+    public long getQax() {
+        return qax;
+    }
 }
diff --git a/processor/src/test/java/org/mapstruct/ap/test/oneway/SourceTargetMapper.java b/processor/src/test/java/org/mapstruct/ap/test/oneway/SourceTargetMapper.java
index 312e4232d..374853096 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/oneway/SourceTargetMapper.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/oneway/SourceTargetMapper.java
@@ -19,6 +19,7 @@
 package org.mapstruct.ap.test.oneway;
 
 import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
 import org.mapstruct.factory.Mappers;
 
 @Mapper
@@ -26,6 +27,7 @@ public interface SourceTargetMapper {
 
     SourceTargetMapper INSTANCE = Mappers.getMapper( SourceTargetMapper.class );
 
+    @Mapping(source = "qax", target = "qux")
     Target sourceToTarget(Source source);
 
     Source targetToSource(Target target);
diff --git a/processor/src/test/java/org/mapstruct/ap/test/oneway/Target.java b/processor/src/test/java/org/mapstruct/ap/test/oneway/Target.java
index 11f8c1898..7efde6d41 100644
--- a/processor/src/test/java/org/mapstruct/ap/test/oneway/Target.java
+++ b/processor/src/test/java/org/mapstruct/ap/test/oneway/Target.java
@@ -21,7 +21,8 @@ package org.mapstruct.ap.test.oneway;
 public class Target {
 
     private Long foo;
-    private int bar = 23;
+    private final int bar = 23;
+    private long qux;
 
     public void setFoo(Long foo) {
         this.foo = foo;
@@ -34,4 +35,12 @@ public class Target {
     public int getBar() {
         return bar;
     }
+
+    public void setQux(long qux) {
+        this.qux = qux;
+    }
+
+    public long getQux() {
+        return qux;
+    }
 }