> >>
> >>   :INCLASS:  ABC {{{c(stuff)}}} DEF
> >>
> >> looks incorrect. Macros are not expanded in node properties (with an
> >> exception for :EXPORT_SOMETHING: when #+SOMETHING is parsed).
> >
> > It is not intended to be expanded when generating the table, but the
table
> > should have the macro in it, so that it gets expanded when the table is
> > exported.
>
> OK. Then another problem:
>
>   :ID: sched_table
>
> ID properties are meant to be set with `org-id'. What about using
> CUSTOM_ID instead?

When using CUSTOM_ID, I get the following message (and the table generation
fails):

condition-case: (error Cannot find entry with :ID: sched_table)

Is this not the case for you?  I have enabled org-collector via M-x
customize-variable <RET> org-modules.