Hi,
Can you tell us if your transport imported with error in QAS system?
If yes,then in SCMA you can click on 'Correct import(repair flag)' button. It will give you the list of transports that went in error for all (*) users in QAS or PRD systems. Then you can select the transports one by one and click 'error corrected' button.
After this you can try again to change the status of CD to 'Successfully Tested'.
If No,please check the job log of collector job SM:TMWFLOW_CMSSYSCOL and see if it is running fine.
The production import queue doesn't get updated with QAS transports due to failure of mentioned job,so when you are scheduling import job it may not be getting any transport to import.
Also, if you have 5 system landscape and you are moving the changes to QAS system of N+1 landscape, and because of ChaRM configuration, changes are not yet allowed to go in import queue of N landscape ,then we get such warnings.
Hope this helps.