Add Item Filter in Purchase Order to get list From Material Request

Hello there,
I want to add new filter in Purchase Order to get list of Material Request and “ITEM” is child table.
Suppose I have Two Material Request.
ReqName Item
MREQ-0001 Cement
MREQ-0002 Plastic

It will show me “null” in place of item name.
please help me.

have you customized this?

If so please share the code, so that community members can help you.

No, This is not the customised. This is the default one provided by ERPNext.
This will open when you click on “Add Items From” option at top-right corner.
I have just added Item Field in it but I want to list out all the Material Request having that item.