How to use SSCC-18 barcode in Zebra Designer for XML


I am trying to print SSCC-18 barcode using a variable from Zebra Designer for XML.  But the print output is not printing (00) in the beginning of the string. 

My variable value: 10495491303156301

My expected value on print: (00)104954913031563017 (last digit is check digit that calculates automatically)

My actual value on print: 104954913031563017

Can someone help me how to resolve this issue.