$ERR_BADKEY
52
Illegal key specified
One of the following conditions has occurred:
- The specified key name does not match a key.
- An implied key specification does not match a key (wholly or partially).
- The specified key index is not in the range defined for the ISAM file.
- On Windows and UNIX, an explicit key of reference specified on a READ or a FIND statement exceeds the number of keys in the file.