Hello everybody,

I would like to ask you help about liferay DXP 7.0 maven theme parent definition. I would like to define a custom theme as parent
for another custom theme in liferay DXP 7.0 maven but I don't know how to do it ?
So, I have my custom common theme with id = common-theme and then I would like to create
another theme called test-theme wich will have common-theme as parent theme. I use maven, so I declare like this :
<plugin>
                <groupId>com.liferay</groupId>
                <artifactId>com.liferay.portal.tools.theme.builder</artifactId>
                <version>1.1.3</version>
                <executions>
                    <execution>
                        <phase>generate-resources</phase>
                        <goals>
                            <goal>build</goal>
                        </goals>
                        <configuration>
                            <diffsDir>src</diffsDir>
                            <outputDir>${com.liferay.portal.tools.theme.builder.outputDir}</outputDir>
                            <parentName>common-theme</parentName>
                            <parentDir>../../common-theme</parentDir>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

When I build my common theme builds successfully but for my test-theme,  I still get this error :
[ERROR] Failed to execute goal com.liferay:com.liferay.css.builder:1.0.26:build (default) on project test-theme: Error: File to import not found or unreadable: imports
[ERROR] Parent style sheet: /home/test-theme/target/build-theme/src/css/main.scss
[ERROR] on line 1 of test-theme/target/build-theme/src/css/main.scss
[ERROR] >> @import "imports";
[ERROR] ^
[ERROR] -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal com.liferay:com.liferay.css.builder:1.0.26:build (default) on project test-theme: Error: File to import not found or unreadable: imports
       Parent style sheet: /home/test-theme/target/build-theme/src/css/main.scss
        on line 1 of /home/test-theme/build-theme/src/css/main.scss
>> @import "imports";
   ^

I want to ask you if somebody can help me ?
Thank you in advanced,
Yours sincerely