Hi Krishan,
by default 'Code 128 SSCC' barcode type ignore alphabet. Rather than you can use subset A or B.
If you should use Code 128 SSCC than you can try to switch the subset to A or B right before the alphabet.
- place a barcode 'Code 128C' or 'Code 128 SSCC' in your template
- in the 'initialize' event put [F1] code first. It is start command of EAN128.
- switch the subset to 'A' with the command [CA] before the alphabet
Similar to this:
this.rawValue = concat("[F1]","01", "17", "21", "[CA]", "U600000626")
Best regards
Istvan