Latest GR date to be automated

Hi Experts,

Pls note, my client uses Latest GR date slot in the PO (delivery tab) for almost all POs. Now to speed up the process they want the slot to be in display mode and it should add ten days (example) to del. date & reflect a latest date. For ex: Del. date is 20-Jan, latest GR date to be 30-Jan.

If not for all cases at least they want it to be done for few of the materials OR few of the vendors.

Is this possible? Please help.

Thanks,

Rajoo