The #A3 Unknown Serial Number could caused by OBPs or by End-Users.
The root causes in case has been caused by OBP:
incomplete upload (serial number not uploaded or correct serial number not uploaded)
one element of the Data Matrix Code appears in the Serial Number field, because group separators have not been set properly
PSUM request done by Manufacturer reaching NMVS before Pack state change, generating alerts
misuse of (bulk) verification of packs by OBPs
The root causes in case has been caused by the End-User:
end-user software sends the wrong Serial Number, with a mismatch to the data encoded in the Data Matrix Code (e.g. incorrect reading of character cases, due to Y/Z transformation - UK/US vs DE keyboard)
the decoding software of the End-user was unable to correctly interpret the group separator characters and/or the scanner was incorrectly configured such that it failed to send the group separator characters
manual entry error by the End-User
failed scanning procedure: batch number incomplete (missing characters) or linear barcode (EAN code) attached to batch number.
For further clarification on this article please feel free to contact the EMVO Service Desk at email@example.com