IBM 5280 Programmer's Manual page 167

Indexed Data Set Organization
Table 6: READ, WRITE, REWRITE, and DELETE Status Codes
Status Key COBOL Detected Error
00
No error detected
10 End-of-file (for SEQUENTIAL ACCESS only).
21 Key out of sequence
22 Duplicate key
23 No record found
24 Boundary error
End-uf-extent
30
I/O Error
See Table 7 for additional causes.
90 No space for insert
92 Key changed between READ, and a REWRITE or DELETE request
(SEQUENTIAL ACCESS only).
Invalid request such as READ when opened for OUTPUT
REWRITE,DELETE during sequential processing not preceded by
successful READ
A WRITE request was made to a shared file when the OPEN mode was
I/O (update).
A delete character was not specified when the data set was allocated.
94
Current record pointer undefined for this READ request (for sequential
access mode only).
97 Data set shut down
B- 6 IBM 5280 COBOL Programmer's Guide