Certain specifications in the dynamic allocation (SVC 99) parameters may make it impossible to stack data sets. The table shown below lists each rejection reason code and a description of the problem it indicates.
Table 17 Dynamic Allocation Consideration Code
Reason Code  | 
Description  | 
|---|---|
90  | 
Control-M/Tape real-time environment is currently not operate in Stacking mode.  | 
91  | 
A VOLSER was specified.  | 
92  | 
VOL=REF=DSNAME was specified.  | 
93  | 
A data set label other than 1 was specified.  | 
94  | 
EXPDT=98000 was specified.  | 
95  | 
A non-standard label (SL) was specified.  | 
96  | 
DISP=NEW was not specified.  | 
97  | 
Data set normal disposition, DISP=(,x), was not CATLG or KEEP. KEEP can be used only when the STKKEEP parameter is set to Y in the CTTPARM member.  | 
98  | 
The volume count was set to a value other than 1.  | 
99  | 
A NOSTACK DD statement was set in the step.  | 
9A  | 
The allocation performed by the Batch Stacking utility (CTTSBD).  | 
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