Serial Number automation in GRPO

Dear Experts,

I want to populate Automatic serial number in GRPO and Delivery document.

EX: I have ordered 100 qty of item A0001 and Also I have 20 already in stock. My last serial number is ABC100020.

Now I want to populate serial no ABC100021 to 100120 in GRPO serial number column automatically or i want to display last serial number (100020).

Regards

Mohamed Yousuf Ali M I