Substitution form doesn't work at all

• It complains about missing data.
• The year is not set.

added part::backend part::frontend prio::1 source::customer type::bug labels

assigned to @hansegucker

created branch 179-substitution-form-doesn-t-work-at-all to address this issue

mentioned in merge request !269 (merged)

mentioned in commit 7c464908

closed with merge request !269 (merged)