Thank you very much for the feedback. I was able to reproduce this case using Tagged Data import. It seems that the data manager does not read alternate tag from SHEMA's TAG_CODE Table. I will run a couple of more test and register this issue as Trouble Report.
As for now, please try to set T-N tag format in Edit Tag Type Dialog as default tag
Now try to import data from xls file as Tagged.
I have run a couple of test and it seems after setting tag, import is successful.
I hope this will help.
Regards,
Artiom