Activate Incompletion log when SKU is not entered in Item level

Hi Friends,

As you know in a sales order if you enter the header level data, you can save the order.

But My question is!! May I know is there any way to activate the incompletion log in the header level / level itself if the SKU is not entered

I tried in the Standards But I 'm not able to get a clue...

Please let me know in case if I'm missing any thing from my end..

Thanks & Regards,

Pugal Stalin