Project 'X' is missing required Java project: 'Y'

Google'd: java maven project build path problems is missing required java project

Reference URL:
https://stackoverflow.com/questions/22050194/project-x-is-missing-required-java-project-y

reference above solving by tweaking in project x, but my case i have to tweak from project y

1. Disable Maven nature for project y.
2. Re convert to maven project again for project y.