In a custom D6->D8 migration module, how does one selectively migrate specific content-types, vocabs and blocks, etc, without receiving the error: 'XXX did not meet requirements. Missing migrations XXX'
I can already selective limit via migrate_prepare_row(), but anytime I do so content related to anything not migrated makes MI throw this error and fail.
Is there any core process plugin that addresses this type of scenario per row?