SSRS MULTIVALUED PARAMETERS

I have a report that I need to allow the user to multiselect a parameter.  The multi select parameter is based on a second dataset, so when the user selects one value that multiselect parameter drop down fills with the correct values.  That all works, but what seems to be input to the stored procedure is 'Parameter1','Parameter2','Parameter3'

I need the input to be 'Parameter1,Parameter2,Parameter3'

Is there anyway I can format the multivalued parameter in SSRS.  

Thanks in advance for any help
sherbug1015Asked:
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Phillip BurtonDirector, Practice Manager and Computing ConsultantCommented:
It's a big subject. I would suggest that you get Packt's SQL Server 2012 Reporting Services Blueprints. Chapter 1 Pages 29-34 talk about creating cascading multivalued parameters.
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ValentinoVBI ConsultantCommented:
The problem you've described is explained in detail in the following article: Reporting On Data From Stored Procedures (part 2)

In short: you need to use a split function to convert the concatenated string to a usable resultset with each value in its own record.

Let me know if you've got any questions after reading the article.

VV.
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