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As you have discovered you cannot refer to two different datasets like that. &nbsp;The only option is using the lookup functions. &nbsp;Have a read through following article for details, let us know if after that you need further help: <a href="https://www.experts-exchange.com/articles/3433/Looking-Up-Data-On-Different-Sources.html" rel="ugc">Looking Up Data On Different Sources</a>
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As you have discovered you cannot refer to two different datasets like that.  The only option is using the lookup functions.  Have a read through following article for details, let us know if after that you need further help: Looking Up Data On Different Sources [https://www.experts-exchange.com/articles/3433/Looking-Up-Data-On-Different-Sources.html]

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Thanks, ValentinoV, I read your article which is very good. But, I do not how I can apply it to my question.
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Thanks, ValentinoV, I read your article which is very good. But, I do not how I can apply it to my question.

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Hi Experts, <br />
<br />
In ssrs, I want to create an expression for the row visibility. But, the expression will contain 2 conditions from different 2 datasets. I have created an expression, but it does not pass in SSRS. The error message is <br />
&quot;The Hidden expression for the tablix ‘Tablix9’ refers to the field ‘launchdate’. &nbsp;Report item expressions can only refer to fields within the current dataset scope or, if inside an aggregate, the specified dataset scope. Letters in the names of fields must use the correct case.&quot;<br />
<br />
Can some one help me to correct it? &nbsp;Thank you. <br />
<br />
=iif (monthname(month(today()))<wbr />= Last(Fields!MonthName.Valu<wbr />e, &quot;DealStarts&quot;) or (Fields!launchdate.Value, &quot;RowofTrendingVisibility&quot;)<wbr />&gt;=Paramete<wbr />rs!StartDa<wbr />te.Value, true, false)
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Hi Experts, 

In ssrs, I want to create an expression for the row visibility. But, the expression will contain 2 conditions from different 2 datasets. I have created an expression, but it does not pass in SSRS. The error message is 
"The Hidden expression for the tablix ‘Tablix9’ refers to the field ‘launchdate’.  Report item expressions can only refer to fields within the current dataset scope or, if inside an aggregate, the specified dataset scope. Letters in the names of fields must use the correct case."

Can some one help me to correct it?  Thank you. 

=iif (monthname(month(today()))= Last(Fields!MonthName.Value, "DealStarts") or (Fields!launchdate.Value, "RowofTrendingVisibility")>=Parameters!StartDate.Value, true, false)

2 conditions from 2 datasets in expression of row visibility

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.

Microsoft SQL Server 2008

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.