Earlier Posting Date on Document Setting ( SAP B1 2005 A SP01 )

Hi..

I'm YunPho

I want to know the Function of Earlier Posting Date on Document Setting ( SAP B1 2005 A SP01 ), i had searching for it in SAP B1 Help, but i didn't get information cleary, because it's didn't give sample.

My opinion about it's function is to block BACK DATE POSTING. e.g. to day is 01/24/07, then system will block document with posting date 01/23/07 or earlier.

but when i do that, it's still can create document with earlier posting date.

is there any setting or other option ?

please help me. Thanks before.

regard

YunPho