Not sure if you ever found the answer! But here it is in case someone else needs it:
If this 'Warning' appears in your SPSS output, then the problem is with SPSS:
"Insufficient memory to process the command.
Execution of this command stops."
Then,
Open a new Syntax document and type:
SHOW WORKSPACE and run it
The output file will show the current memory allocated to SPSS as:
6144 KB
Now, you want to increase this in multiples of 2 or 3:
type in syntax document"
SET WORKSPACE= 12288 and 'run' it
Now, type SHOW WORKSPACE and 'run'
The output document should show you 12288KB.
You are laughing now and you can run complex analyses, which will eat up your memory!!
Cheers,