Soft delete fails with error message

Hi,

i have user in the moderator-group. They have following permissions:

• Forum moderation permissions:
  Can permanently delete posts --> never
  Can soft delete posts --> yes

• Forum based permissions:
  Can permanently delete own posts: yes
  Can soft delete own posts: yes

• Global moderation permissions
  Can permanently delete posts --> never
  Can soft delete posts --> yes

If the user deletes his own posts:

• permant delete
• soft delete
  are both possible.

If the user tries to delete other users posts:
"You cannot delete posts in this forum."

But shouldn't he be able to soft-delete the posting, but NOT permant delete it? Thats what is the aim, of these settings.