SYMPTOM:
When upgrading the project to Strategy 9.x through Configuration Wizard, the following error message is thrown terminating the upgrade process completely.

Also following error message gets logged in MD update log:
2011-05-24 16:20:31.302-03:00 UNEXPECTED ERROR: (0x80041F56) This 'Project' object cannot be locked because one or more of its constituents have conflicting locks placed on them.
CAUSE:
Either the project itself or its configuration or one of its schema objects are already locked and hence the upgrade process is unable to put lock on the project.
ACTION:
Administrator needs to remove these locks through Strategy Developer by going to the following menus:
Administration -> Locking
Schema -> Unlock Schema
In some cases, there are locks present for that particular project in the metadata which can't be seen and unlocked through the developer. In such cases, contact Strategy Technical Support to remove the locks in the metadata.