Codesoft: creating a barcode formula

[flaviooooo]

Hi,

I'm trying to create a variable formula for a barcode in codesoft.
The formula should be something like this:

@C@10012345@K

with 00 and 123456 being variable fields (field1 and field2)
@C stands for code C
@1 stands for FNC1
@K stands for Modulo 10 on the 17 previous characters

Does anyone have any experience with this kind of formual coding?

Thanks in advance,
flavio