The Magento data migration tool up to (at least) versions 2.2.7 and 2.3.0 has a bug, which removes the "apply_to" fields for (e.g.) price. This causes the price field to appear for grouped products. See this issue.
There is currently no direct composer integration, so put
{
"type": "vcs",
"url": "git@github.com:wilfriedwolf/data-migration-tool.git"
}
to the "repositories" section and
"snm/magento2-module-fixdatamigrationforgrouped": "0.0.1",
to the "require" section in your composer.json.
Alternatively you can download the source code and put it in the appropriate folders.
Since the tool contains a plugin executing bin/magento setup:di:compile is required before
starting the migration.
Feel free to fork and contribute to this module. Simply create a pull request and we'll review and merge your changes to master branch.
Sandstein Neue Medien is an internet agency located in Dresden/Germany. For more information, please visit www.sandstein-neue-medien.de.