solution to our inplace error was to truncate tabels mentioned in this article.
VMware vSphere VCSA 6.5 to VCSA 6.7 Postgres Upgrade Error Fix - Virtualization Howto
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Moderator: Moved to vSphere Upgrade & Install Discussions
Can you please share more information such as what you see in "vcdb_inplace.err" and what kind of migration would you attempt to do?
You can also check this article
we are doing an upgrade from 6.5-6.7 and it fails when it is around 60% we have checked the database prior to upgrade and all tables is owned by VC.