Aggregation function keeps report from opening objects

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Hi,

 

When I have an Incident report and I add a column that is a sum of a field on a linked object, then I cannot open any records from the report any more. Is this normal?

 

I have an object charges which has several lines per Incident. I sum up the amount and show it in a column on the Incident report. However, after adding the column, the Records button is greyed out and I cannot open any records from the report anymore.

 

Do you know if there is a way around this?

 

Best regards,

Clemens