Hi, I asked how to add items to the sales order list a few days ago.
Thank you for your answers.

I have found a problem that sales order list cannot be filtered.
I have observed that it is because of the last modification date. Sales orders that have been modified after I added "item no."to sales order list can be filtered.
So I want to know how to modify the last modified date, or what I can do to make every The last modified date field of a sales order has a value. Thank you!!
