Column not instance of As in get_amount
Job [#2514376](https://foss.heptapod.net/tryton/tryton/-/jobs/2514376) failed for 1068f3af092a9a0da63c30a0c2440e2fa4ce6f55: Since 530295147233 `AmountMixin.get_amount` uses `sqlite_apply_types` but `BudgetLine._get_amount_query` does not set an alias to the amount column.
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