EXTERNAL DDname xxxxxxxx can only be used by a single report
Explanation
The EXTERNAL operand specified a DDname that is used
by a previously requested report. An External Work File can only be
used by a single report.
System action
The report is ignored and command processing continues.
User response
Ensure that each report requiring an External Work
File has either a unique EXTERNAL specification, or enough External
Work Files files are defined in the pool. The External Work File
pool consists of all DD statements in the JCL prefixed by CPAXW. See
External sorting for information on the DD
statements for External Work Files.