Microsoft Report Builder 3 - Running total of non unique feilds

I have a report from a production system written with MS Report Builder 3 that I need to load into a ERP (with the ability to run a SQL script beforehand).  The report from the production system has some records with identifiers that are not unique and before I load into the ERP I would like to add a trailing digit to make them unique.  The trailing digit is the count of each instance (ie first instance is 1, second is 2 etc)

Data:

Record/Volume
A1/100
A2/50
A2/75
A3/200

Required data
Record/Volume
A11/100
A21/50
A22/75
A31/200

Ideally I would like to do this in MS Report Builder if possible because there are a lot of other moving parts in the current SQL script.

Is it possible to somehow get a count or the like in each row of the Report Builder report?  I have tried but am getting aggregate function errors.

Thanks
froodoxAsked:
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Nico BontenbalConnect With a Mentor Commented:
You can use the RowNumber function for this. See http://technet.microsoft.com/en-us/library/ms159225%28v=sql.100%29.aspx.
Because you want to restart the count for every new value of the Record field, you need to create a group for this field, and use the name of that group as the scope for the RowNumber function. See the attached sample report. Assuming the fields are named Record and Volume, and the group for the Record field is named Record, the expression would be:
=Fields!Record.Value & RowNumber("Record") & "/" & Fields!Volume.Value

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RowNumber.rdl
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