When a change request is created from a RITM, later from this change request if we open the parent RITM change its variable value and save the RITM, then the change request is no longer associated to the RITMIssue After a catalog item is submitted when a change request is created from the RITM, the newly created change request has its 'Parent' field set to this RITM . Later from the change request form opening the parent RITM changing its variable value and saving the RITM form, clears out the 'Parent' field on the change request.CauseThere is a custom after update business rule defined on 'sc_req_item' which is clearing out the 'parent' field of the change request causing the issue.ResolutionDeactivate the custom business rule to resolve the issue. Review this custom business rule and modify it based on your business requirement.