purchase_order_lines = set(self)
for order, lines in self.grouped('order_id').items():
if not order:
lines.parent_id = False
continue
last_section = False
last_sub = False
for line in order.order_line.sorted('sequence'):
if line.display_type == 'line_section':
last_section = line
if line in purchase_order_lines:
line.parent_id = False
last_sub = False
elif line.display_type == 'line_subsection':
if line in purchase_order_lines:
line.parent_id = last_section
last_sub = line
elif line in purchase_order_lines:
line.parent_id = last_sub or last_section
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