What is the required action to add a reference line to a bar chart?

To add a reference line to a bar chart in Qlik Sense effectively, creating a reference line using an expression such as Max(Aggr(Sum(Sales),CompanyName)) is the correct approach. This expression calculates the maximum sum of sales for each company, which provides a variable reference point that can dynamically respond to the data displayed in the bar chart.

The use of aggregate functions within the expression allows for advanced analysis because it considers the business context, such as comparing total sales across different companies. This level of specificity is beneficial for visualizing crucial metrics and trends comprehensively.

In contrast, adding a static line manually may not accurately reflect changing data over time or under different conditions, as it would not adjust based on the underlying dataset. While using the average of sales can be insightful in certain contexts, it lacks the depth of analysis offered by the peak sales calculation. Similarly, incorporating a calculated field for sales might enhance your dataset but doesn't directly provide a way to set a reference line in the bar chart. The dynamic nature of the proposed expression ensures that the reference line remains meaningful and relevant to the visualized data.