HID EDGE Solo v120 User Guide - Manual (Page 49)

Troubleshooting
45
Symptom Solution
added using a format could be a duplicate of
a card added as “Raw Hexadecimal.” Error: 19
SO_CONSTRAINT; Source: Data Storage If the card was added previously by swiping,
you will not see the same card number as you
see printed on the card itself. When you add a
card by swiping, the card number is in raw hex-
adecimal format, which means the numeric val-
ue looks different.