Staus Tab Freeze While Creating Financial Documents

Dear Gurus,

While I am creating Financial document, and during inputing data if goes on the "Status" tab page All the statsu are freeze.

Can any one do let me know that why system behaving like this.

Becasue of this while i am assigning the FD document to the sales order system give me the "NOT OK" message.

Hope if gurus assist me for this.

Regards,