Issue

Users cannot check in Views/Forms checked out by another user.

Symptoms

Users will not be able to check-in views/forms in the following situations:
- A different user has been checked out the view/form.
- The current user changed his/her username.

Troubleshooting Steps

Please log a support ticket and have the K2 Ops team force check in the forms/views in order to resolve this issue.
The following steps can be used when updating the K2 database:
- Collect the GUID of the form from Form.Form_Design table/ Collect the GUID of the view from Form.View_Design table.
- There is a SQL script to force check in the checked out form/view by providing the GUID collected.

Also see: http://help.k2.com/support-services/kbt150389 

Do not modify any database definition or database content unless specifically instructed to do so by K2. No changes to the K2 Database definition or content are supported unless specifically instructed by K2. 
Direct read access or modification of the data in the K2 database is also not supported, unless specifically instructed by K2, except for the ServerLog table where direct read access is supported. 
Any modification of the K2 database or content may result in system instability or failure, therefore it is highly recommended to make backups of the K2 database prior to performing any modification, even when instructed to do so by K2. 
This database schema reference is provided for informational purposes only. Note that database schemas may change between product versions, so if you have written custom queries against the K2 database, those queries may break between product versions.