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When multiple processes attempt to access the same SPDE data set, the message:

   ERROR: Member lock is not available for SPDE.any.DATA, lock held by
   another process

may be generated in the log ("any" is the name of the data set).
The message is generated when attempting to obtain write access to
a SPDE data set. Write access requires exclusive access to the data
set which can not be granted while any other process has either
write or read access.

While the above scenario can occur at any maintenance level, file
handle caching was introduced in 9.1.3 (9.1 TS1M3SP4) and may cause
the problem to occur more frequently. File handle caching can be
disabled by specifying the following in the autoexec file:

options debug='spde: cache_disable';

The option has to be set for every process that accesses (read or 
write) the SPDE data set and prior to establishing the SPDE libname.

Operating System and Release Information