I am creating a report showing Account balances for every fiscal period. I need some suggestions ......if there is no activity in a month, the report should display the previous balance in missing period. 
for example:
Fiscal period  account     curr Balance         prev balance
00                  1031      $-12,705,140.15     $-12,299,868.93
03                  1031      $-12,699,404.32     $ 0.00 
I would like to add fiscal period 01 and 02 and show the balances as $-12705,140.15    $-12,299,868.93
Please help.