We’ve evaluated a bunch of them. Some of the ERP systems open line details as full page (ie not a dialog like Frappe). So these type of ERP systems let you create n-th grand child level records. Each sub-level record have full-page.
When I first see the dialog of the grid detail then I know that this should be the limitation.
I overcome that by creating another doctype and linking in the child doctype.
While “Grid in a Grid” describes the functionality in a “scarry” visual way
The use-case I was trying to present was much simpler.
The grandchild field does not have to be visible in the Child Table
When one clicks EDIT to open a child table row currently there is no way to have another child table on that form.
I believe all we need is to assign the Child Table’s ROW as the Grandchild Table’s parent
currently it seems that Grandchild Table’s parent is the Main Parent