As part of pre update steps to 7.1.9 from 7.1.7 , a script has to be run to add the pzTenantId column to the table pr_data_admin_product.
Since the current system is not a multi tenant system, it has been decided to skip this script execution. If in the future , a multi tenant architecture is adopted (which will probably won't happen but just in case ), will there be any issue if this script execution is skipped now?
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There will be no problem if you skip the script execution now. However, if you adopt multi-tenant architecture in the future, you can upgrade your pega 7 to multi-tenant and then upgrade your applications. Or you can do a fresh install of pega 7 that supports multi-tenancy and then migrated your applications. You can also refer to the upgrade guide that is available to you for 7.1.9.