ID 359381 - Can't import AAFs from branches other than main

Problem summary
Cannot use AAFs created in other branches
Customer reported version

Customer reported platform
10.11

Steps to reproduce

1) Publish from avid to multiple branches, A and B

2) On the editorial page, try to use an AAF from branch A in branch B

Workaround
Unknown

Reproduced by support
Reproduced in release versions from 52v5 - 5.4v1

Earliest version tested
5.2v5 - This issue appears to be in all versions of the product

Expected behaviour
Flix should be able to publish to editorial using AAFs regardless of the branch they were created in.

Actual behaviour
A non-descript error message appears on the editorial page