SSRS Report Help

Job ID: 33510489

Budget: $10 – $30 USD

Not sure it is possible but I wanted to ask a SSRS expert. I need to build a connection string from fields in a dataset. but I keep getting an error. The string I'm trying to generate is for an api that generates a barcode. Is it possible? (see attached screenshots). If so how can I set this up?
Screenshots
1 Requirement
2. Data source/Dataset setup. I am trying to build the BarcodeDataSource
3. Adding second part of requirement to datasource
4. error I get
Note the scan report data will only return 1 row. but i'm not sure how to keep it from being an aggregate if this would make a difference
Related categories: Report Writing Crystal Reports