Maybe it'd be easier not to use outline numbering.

Just type "SECTION" in your Heading 1, format it as not bold.
Then insert a SEQ field (creating the field braces with Ctrl+F9):
{ seq H1 \*CardText \*Upper }
Format that bold, and you should be set.
You'd need to use Ctrl+A, F9 to update the numbers.
If you still see field codes, use Alt+F9.

If you have many headings, you can select the properly formatted
SECTION{ seq H1 \*CardText \*Upper }
and create an AutoText entry for it.

Good night!
Klaus