FAS2020: The size must be a simple number like '3' or '512'

I was trying to create 1.3 TB of ISCSI lun on FAS2020 NetApp filer. It was throwing below error message. Looks like it has different version of DataONTAP running.

So what I did is I created 1TB of LUN without .0 so like 1TB. I then got below mention successful message.

I then supply the size as 1099529453568*1.3=1429388289639

When I recheck the lun size 1.3 TB.