SAPscript barcode printing.

I am having some issues printing a barcode in Sapscript on SAPWIN/SWIN(LOCL on access method 'G')

This barcode is C128A(found on SE73) which is part of 'new bar code technology.  When we print it on SAPWIN/SWIN , barcodes prints  as shown below(lower barcode) but it doesn't scan .  When we print it through a device type for XEROX(Device type XRW001) , its scanning without any issues.

If you look at the barcodes clearly, you can clearly see that the top start with a 'thick' bar , while the lower stars with a 'thin' bar.  Why is this?

How can we  use SAPWIN/SWIN to print the correct bardcode?

thanks