Error while performing Hiring action (PA 40)

Dear Gurus,

I'm getting an error while performing PA 40 Hiring Action.

My control record date is 01/2000 and also i have maintained

01.01.2000 date for all the records. And in PA40 i'm trying to hiring

an emp on 10/04/2000/ 2001 etc..

When i'm saving IT0001, the session page is going to sap client login

page and after providing login details its getting back IT0007 with

this error.

Error: "change in earliest retoractive accounting date time not

possible".

Kindly let me know why this issue is coming.

Thanks & Regards,

Munna