Error: The section could not be loaded. An error occurred before executing the process 'Marketing Effort Segment Record Count Calculation' : Error calculating the segment record counts: Subquery returned more than 1 value. This is not permitted when the

When a user adds an appeal mailing they may receive the error: 

The section could not be loaded. An error occurred before executing the process 'Marketing Effort Segment Record Count Calculation' : Error calculating the segment record counts: Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.
We are currently evaluating this issue and will update this article when we have more information.

Environment

 2.94.1524, patch 56

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