DryTrade article numbers start with 3 letters and 3 digits, then one letter as checksum. One key error alone won’t write another article number.

The article number is 7 characters long for an article in standard package, the next size package is 8 characters long and ends with an “A” and then “B”, “C” etc. Note however that letters I and O and the digits 1 and 0 have been avoided, to minimize reading errors.