Planned Delivery Time

Dear Experts

Im facing One Requirement at my client site that, System Should consider the Planned delivery time in PO. for Example, po is created on 01.01.2008 and Planned delivery time given 2 days, system should not allow to do GRN after the 03.01.2008. . is there any possibilities ...?? Please let me know

Pavan G Kulkarni