Open documents and year end closing.

Hi experts,
I would like to know if it is necessary to close all open documents before we start the year end process.
Since practically it is not possible to close all open documents.
here open documents refer to Purchase orders, GRPO's, Sales orders, deliveries etc.
kindly suggest.

hi ajith,
Purchase orders,sales order won't have any impact on accouting which will only
effect ordered,committed quantities.
GRPO can be kept open in case when there is orginal bill is yet to be sent by vendor.
Production orders which are open(ie) production completed - should be closed atleast
before year end so that it can't avoid unnessary WIP variance posted in next fiscal year,
because production orders will post JE's only on Actual Closing Date.