Reproduced on Ibexa Experience v3.3.6

Steps to reproduce:

• create content structure as shown in 1-multi-location.PNG

├── Folder A
│     └── Content 1 (-> second Location - "Editor" has *full* access here)
└── Folder B
      └── Content 1 (-> Main Location - "Editor" has *no* access here)

• change Editor Role as shown in 2-multi-location.PNG (Editor should have full access to Folder A subtree) 

• create User "editor" in "Editor" User Group
• login as "editor" user
• access Content->Folder A->Content 1

Result:

• an exception is thrown (see  3-multi-location.PNG)

Expected Result:

• User should have full access to "Content 1"