GL Setup Menu/Source Journal Maintenance.  Pull up PR journal and sort by Number in bottom section.  Get the last number and put the next number after it into the Next Register Number in the middle.

There is an option to Reset Journal Numbers, Register Numbers in General Ledger_Setup_General Ledger Options, Entry Tab.  Choices are Never reset, Period End, or Year End.  This option is for all Source Journals.  There is not an option to select by Journal or Module.