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Module: Purchase

Entity: purchase.order

Compute Method: _compute_show_comparison

Inputs Method Outputs 
line_groupby_product = self.env['purchase.order.line']._read_group(
            [('product_id', 'in', self.order_line.product_id.ids), ('state', '=', 'purchase')],
            ['product_id'],
            ['order_id:array_agg']
        )
order_by_product = {p: set(o_ids) for p, o_ids in line_groupby_product}
for record in self:
            record.show_comparison = any(set(record.ids) != order_by_product[p] for p in record.order_line.product_id if p in order_by_product)

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