The correct code is essential for reordering keyed alike locks. If you have lost the corresponding CodeCard and the key number is not shown on your purchase documents, the key can be read by sending it to an ABUS bicycle dealer.
Then it is possible to remanufacture keys, create a new CodeCard and subsequently order keyed alike locks.
(hint: some XPlus locks models cannot be keyed alike to bicycle locks i.e. motorcylce locks 58, 59 etc.)