User Exit in MIRO & MIR7

Hii

My Query is i have a GR (agt PO) Document posted on For Eg: 20.03.2007 when i do invoice verification prior to the Posting date of GR Document system is allowing me to post the vendor invoice.

Is there any check to control this feature??

Why system is allowing the Invoice Verification prior to the GR Posting Date?

Thanx & Regards,

Kumar