In Custom Reports, What Must Metrics And Dimensions Share In Order To Report Accurately?

Same scope 

Answer: In Custom Reports, metrics, and dimensions share the same scope for the accurate reporting purpose.

• Same Custom Report
• Same View
• Same Scope
• Same Index

Explanation: We cannot combine every metric with every dimension. It is because each dimension and metric has its own scope: user-level, session-level, or hit-level. In most cases, it only makes sense to combine dimensions and metrics that share the same scope.

In Custom Reports, metrics and dimensions must share the same scope to generate accurate reports.

Read More Here: https://support.google.com/analytics/answer/1033861

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