Since it is not possible to sum target fields into another target field, we need to sum and multiply the source Price fields into the target Amount field. The XPath expression looks like this.
因为不可能将目标字段的和作为另一个目标字段的值，所以我们需要求和，并乘以源price字段，作为目标amount字段的值。
Since it is not possible to sum target fields into another target field, we need to sum and multiply the source Price fields into the target Amount field. The XPath expression looks like this.
因为不可能将目标字段的和作为另一个目标字段的值，所以我们需要求和，并乘以源price字段，作为目标amount字段的值。
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