I've got a project with a main composer.json and a merged composer.json which I'm trying to use to install a private git project.

With the repository and require config in the merged JSON file the project isn't installed with composer giving a 'package ... could not be found in any version' error.

Moving the repository and require to the main composer.json files results in the package being installed.

A package which is listed on packagist (doesn't require a repository entry in the composer config) installs ok from the merged file.

The installed composer-merge-plugin is at 361e098