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Wow Thanks @ wdosanjos!<br />
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I am sort of a newbie, Then I would use the RunningValue? I am trying to get the net value for the invoice but, I am getting the line value with the sum() expression.
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Wow Thanks @ wdosanjos!

I am sort of a newbie, Then I would use the RunningValue? I am trying to get the net value for the invoice but, I am getting the line value with the sum() expression.

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I'm not sure I understand your last question/statement, but you can use the Calculated Value as any other field defined in the Dataset.
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I'm not sure I understand your last question/statement, but you can use the Calculated Value as any other field defined in the Dataset.

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SSRS indicates that you can't use calculated fields for aggregates &nbsp;(ReportItems!Textbox56.val<wbr />ue) is a sum of one field added to another.
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SSRS indicates that you can't use calculated fields for aggregates  (ReportItems!Textbox56.value) is a sum of one field added to another.

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How do you calculate RunningValue with (ReportItems!Textbox56.val<wbr />ue) type of values. <br />
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The calculations are in decimal values and (ReportItems!Textbox56.val<wbr />ue) calculation is &nbsp;= IIF((((Fields!UNITBIDAMOUN<wbr />T.Value) &lt;&gt;&nbsp;0 or (Fields!BILLINGQTY.Value))<wbr /> &nbsp;&lt;&gt; 0) , (Fields!UNITBIDAMOUNT.Valu<wbr />e) * ( Fields!BILLINGQTY.Value), 0)
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How do you calculate RunningValue with (ReportItems!Textbox56.value) type of values. 

The calculations are in decimal values and (ReportItems!Textbox56.value) calculation is  = IIF((((Fields!UNITBIDAMOUNT.Value) <> 0 or (Fields!BILLINGQTY.Value))  <> 0) , (Fields!UNITBIDAMOUNT.Value) * ( Fields!BILLINGQTY.Value), 0)

SSRS Expressions

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.

Microsoft SQL Server

SQL Server Reporting Services (SSRS) is a server-based report generation software system from Microsoft. It can prepare and deliver a variety of interactive and printed reports and is administered via a web interface or its web service. Its web services interface also supports the development of custom reporting applications. Finally, SSRS can also be integrated with SharePoint. SSRS competes with other business intelligence tools, most prominently Crystal Reports.

SSRS

Microsoft SQL Server 2008 is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning. Major improvements include the  Always On technologies and support for unstructured data types.