Syncing from upstream OCA/server-tools (18.0) - #2111
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…transaction detect_exceptions() opens a second, genuinely independent DB connection (self.env.registry.cursor()) to write exception flags so they survive a rollback of the ongoing transaction. It then re-derived main_records through that same second connection (self.with_env(new_env)), which crashes with MissingError whenever _get_main_records() has to read a field on records created earlier in the SAME ongoing transaction and not yet committed (e.g. sale.order.line._get_main_records() reading order_id right after the line was created by write()). Typical trigger: adding a product to an already confirmed sale order. sale_exception.write() re-runs detect_exceptions() on order_line whenever order_line changes on a confirmed order; the new line only exists in the ongoing transaction, so the second connection can't see it yet. Resolve main_records once through the original (main) cursor, which does see the just-created records, and only rebind that already-resolved recordset to the new environment for the exception_ids check.
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