The "Export as pdf" option on "Service Portal" does not apply the source related list filtering which set as part of relationship (sys_relationship).
Steps to Reproduce
1. Login as administrator in the native UI.
2. Configure the Incident form to include the related list "Incidents by the same caller".
3. Go to /sp Service Portal homepage.
4. Click on the menu option Request > View All Request.
5. Open one of the records from the list.
6. The record is loaded with page id=ticket. Change it to id=form.
7. Scroll down to the bottom of the page and click on the related list "Incidents by same caller".
8. Click on the top-left option "Export as pdf". Notice all the incident records from the instance are exported, the filter of the relationship is not taken into account.
This problem is under review and targeted to be fixed in a future release. You can Subscribe to this article to receive notifications when more information will become available.
Related Problem: PRB1331472