The specified alternative logging log data set or GDG data set is being used by another job. This error can occur for the following reasons:
More than one instance of PowerExchange is installed on the system.
Multiple PowerExchange installations on different systems use shared DASD.
PowerExchange writes all messages to the default PowerExchange log file and does not use the alternative log.
Change the value of the LOGPATH parameter, and the PFX parameter in the TRACING statement, to generate log file names that are unique across your PowerExchange installations.