Random Weight Items On POS 2009

Hi
How Can I Add Random Weight Items With this BarcodeFormat (FFCCCCCXXXXXCD) in MS POS 2009?
FF: Flag (20-29 in store barcode)
CCCCC:(Item Number : #####)
XXXXX: (Quantity Or Weight)
CD ( CHECK DIGIT BASE ON EAN 13)
Example: 2210001123455 >>
22 : Flag
10001 = Item Number
12345 = 12.345 (12345gr or 12.345kg)
5 = Check Digit
Note: in Price embedded Barcodes Section OK Button Is Always Disabled (I don't know why I can't Add new barcode Format)(How Can I Enable it???)
Please Help Me
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