IGW01504E

Explanation
An unexpected error was encountered while attempting
to allocate or deallocate the data set indicated in the message.
In
the message text: return-code
The DYNALLOC return code.
reason-code
The DYNALLOC reason code.
dsname
The data set name.

System action
The data set will not be accessible for the remainder
of this invocation. Additional messages may follow this one.

System programmer response
Examine the return and reason code.
Refer to z/OS MVS Programming: Authorized Assembler Services Reference ALE-DYN 
 for a description of DYNALLOC return and reason codes.

Source
DFSMSdfp and
File and Attribute Management Services.

Routing code
11

Descriptor code
6