many-to-many relations and portals
I will try to describe my problem as brief as possible:
Thank you for your post.
It sounds like you may have either:
1. A portal into a second table occurrence, that when deleted, would cascade to records in the same table
2. A portal that linked to another table that is affected during the deletion process.
You may want to make sure when you are deleting a portal row, what effect it has on the related tables.