Compress Journal Before Post

Select this check box if you want the system to compress the journal(s) before posting the transactions. Do not select this check box if you want only to post the journal(s).

The Mass Journal Posting activity performs all processing in a single pass; you do not need to run it twice (that is, once for compression and once for posting).

Caution: 
If you compress the journal, all journal control numbers will be deleted.
Note:  Mass journal posting and journal control numbers do not apply to multi-FSB journals.