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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As Figure 1 shows, this feature works much like a Q replication scenario where both source and target are DB2 Universal Database servers.

如图1所示，该功能的作用机制与源和目标都是DB 2 Universal Database服务器的Q复制场景十分相像。

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