IDC3020I UNABLE TO ALLOCATE SPACE ON USER VOLUME

Explanation
A specified volume cannot accommodate either the
initial allocation of space or a subsequent extension. See the associated
second-level message for the specific catalog management error code
values.
In the Time Sharing Option/Extensions (TSO/E) environment
the second-level message is not displayed, except  by request. To
request it, enter a question mark (?) after the TSO READY message.

System action
The system ends the command.

Programmer response
Scratch unneeded data sets from the volume,
or run an ALTER command to add candidate volumes for the data set.

Source
DFSMSdfp

Module
IDCTP06