**Steps to reproduce**

1. Begin of the insertionmake sure that your OP instance can handle multiple HTTP requests simultaneously (QA systems do)
2. End of the insertion Open Begin of the insertioneditEnd of the insertion Begin of the deletion create/editEnd of the deletion form of work package (split screen).
Begin of the insertion3.End of the insertion Begin of the deletion 2.End of the deletion Add multiple attachments at once Begin of the insertion
\#\*End of the insertion Begin of the deletion (probably:End of the deletion the more the Begin of the insertionbetter
\#\* choose equally sized files for best resultsEnd of the insertion Begin of the deletion better)
3. (for create: actually press save)End of the deletion

**Actual behavior**

- One/some attachments are not uploaded with unclear error message
- not explicitly communicated, but it is an internal server error

**Expected behavior**

- successful upload

**Details**

[According to new relic errors this is a concurrency issue](https://rpm.newrelic.com/accounts/228346/applications/5682326/traced_errors/56b4e0-f14fb068-5571-11e5-be55-f8bc12425d50)

The saving of journals might create duplicate versions for the same journable (only detected because we have a unique index that enforces our uniqueness constraint).

**Screenshot**

- Note: Actually 4 attachments were added during creation process but only 2 were added:

**QA system**

- org-dev.qa.finn.de
- OpenProject 5.0.0