LTMC - Source record already transferred to target system

Dear Expert,

I am on S/4 Hana 1809. I tested upload contract sucessfully via LTMC in QAS 600 and then I exported it as the template, which is a zip file for future use.

Now I import that zip file to QAS 650 and try to use the same file to upload. System give warning message saying

Source record xxx already transferred to target system and ignoring the upload. May I know what is wrong with my steps? Is it because the zipped file already contained the upload history in QAS 600? How can I avoid it for PRD upload?

Thanks a lot!