fix: Parent Level project linkning on creating PO from project

(cherry picked from commit 93e134aab0)

erpnext/projects/doctype/project/project.js

@@ -134,6 +134,7 @@ function open_form(frm, doctype, child_doctype, parentfield) {
 		new_child_doc.parentfield = parentfield;
 		new_child_doc.parenttype = doctype;
 		new_doc[parentfield] = [new_child_doc];
+		new_doc.project = frm.doc.name;
 
 		frappe.ui.form.make_quick_entry(doctype, null, null, new_doc);
 	});