With classes derived from CustomizationPlug you can utilize capabilities of the Acumatica Customization Platform and execute custom code after the customization project has been published. In this topic you will learn how customization plug-ins can be used to make changes in multiple companies.
More information on customization plug-ins is available in Acumatica Customization Guide
When publishing a customization project, you might see some item being skipped for the reason of being already applied. Ex:
EntityEndpoint EntityEndpoint#6.00.001§DefaultPlus(skipped, already applied)
This can happen for any items contained saved in the database. Ex: Generic inquiries, reports, site map nodes, DB scripts, system locales, import/export scenarios, shared filters, access rights, wikis, web service endpoints and analytical reports.