根据另一个列值（SSRS）计算一列的总和

Question

数据如下图所示（源描述和总份额）为两列

  

来源494,482,729,319.98998
     首字母
     已过滤
     最终494,482,729,319.98998

我的表达式在报告的输出（预览部分）中引发#Error

=SUM( Fields!total_shares.Value * 
SWITCH(Fields!Source_Description.Value = "Initial" OR Fields!Source_Description.Value = "Inserted", 1,
        Fields!Source_Description.Value = "Filtered" OR Fields!Source_Description.Value = "Deleted" OR Fields!Source_Description.Value = "Final", -1,
        True,0
        )
)

你能帮我哪里错了吗？