The variant key identifies a selection variant for the line item reports RFITEMAR (customers) and RFITEMAP (vendors). When you set up the Internet line item services FBWARI0 and FBWAPI0, ~VARIANT is specified as the parameter value in the URL.
Example for the syntax:
http://<Server>/<Path name>/scripts/wgate/FBWARI0/!?~VARIANT=<Variant key>
Only the following characters are permitted for the variant key, with no differentiation between upper and lower case: ABCDEFGHIJKLMNOPQRSTUVWXYZ_0123456789