Created a non submittable parent doctype and a child doctype

[management]

created a non submittable parent doctype and a child doctype. Inside parent doctype I have used as table the child doctype then why it is not getting saved when adding data in child table and trying to save in parent doctype

[Usama_Naveed]

Can you please share the screenshot for more clearance

[management]

child doctype

settings of parent doctype

Added data in table

When clicked on save the table is blank