To remove an association

Select one or more change requests in the Associated Records list.
Click Disassociate to remove the selected change requests from the Associated Records list.
Confirm removal of the association by clicking OK.
Click Cancel to discard unconfirmed changes you have made to the associated requests for this version. Clicking Cancel stops a checkin that is in progress, but it does not stop a checkout.

Tip: Your project manager may have configured a VOB to require a checked-in version to be associated with one or more change requests. This requirement may apply to all branch and element types in the VOB, or it may apply only to some branch and element types. If this requirement is in force for the version that you are checking in, the version must be associated with at least one change request; otherwise, the checkin cannot proceed.