Could not find a pom.xml file! Please check that it exists and is committed to Git

This is the folder structure of my project:

- Root-folder
    .git
    projecname
        Procfile
        pom.xml

This is the Procfile configure:

web:    java $JAVA_OPTS -jar target/dependency/webapp-runner.jar --port $PORT  --proxy-base-url https://projectname.herokuapp.com target/*.war

I used Profile to deploy project on heroku from Local:

cd projectname
git push heroku master

but I got the erorr when deploying:

remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> App not compatible with buildpack: https://buildpack-registry.s3.amazonaws.com/buildpacks/heroku/java.tgz
remote:        Could not find a pom.xml file! Please check that it exists and is committed to Git.
remote: 
remote:        More info: https://devcenter.heroku.com/articles/buildpacks#detection-failure

as I understand, the reason is: the root folder that Heroku use to run maven build is the same folder containing .git is: Root-folder and the pom.xml file is in Root-folder/projectname folder.

So my question is how can I set the build path to heroku know where is containing the pom.xml file?

Thank you in advance.

SOLVED

I have read this article: https://medium.com/@timanovsky/heroku-buildpack-to-support-deployment-from-subdirectory-e743c2c838dd

then setting PROJECT_PATH by command: heroku config:set PROJECT_PATH=projectname

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