plugins/devkit/testData/inspections/registrationProblems/xml/ComponentMultipleWithSameInterface.xml

<idea-plugin>
  <application-components>
    <component>
      <interface-class>ApplicationComponentInterface</interface-class>
      <implementation-class>ApplicationComponent</implementation-class>
    </component>
    <component>
      <interface-class><error descr="Multiple components with the same interface-class are not allowed">ApplicationComponentInterface</error></interface-class>
      <implementation-class>ApplicationComponent</implementation-class>
    </component>
  </application-components>

  <module-components>
    <!-- within same module type -->
    <component>
      <interface-class>MyModuleComponentInterface</interface-class>
      <implementation-class>MyModuleComponent</implementation-class>
      <option name="type" value="JAVA"/>
    </component>
    <component>
      <interface-class><error descr="Multiple components with the same interface-class are not allowed">MyModuleComponentInterface</error></interface-class>
      <implementation-class>MyModuleComponent</implementation-class>
      <option name="type" value="JAVA"/>
    </component>

    <!-- different module type -->
    <component>
      <interface-class>MyModuleComponentInterface</interface-class>
      <implementation-class>MyModuleComponent</implementation-class>
      <option name="type" value="OTHER"/>
    </component>
  </module-components>
</idea-plugin>