Does CCF support version control in combination with requirements?
If CCF detects that version control is enabled for HP QC requirements, it tries to checkout requirements before performing update operations. If the requirement has already been checked out by another user, CCF will quarantine the artifact (error code: objectCheckedOutError), so that you can replay quarantined artifacts later. You could also define a rule to automatically replay artifacts of this error code. For bidirectional synchronizations with heavy parallel use on both sides it might be easier to turn version control off if you do not rely on the base lining features of HP QC.