What condition must be met regarding business dimensions for successful PCMCS application validation?

For successful application validation in the Profitability and Cost Management Cloud (PCMCS), it is crucial that all business dimensions include members. This condition is fundamental because each dimension represents a specific aspect of the business, such as products, customers, or cost centers. If a dimension is empty or lacks members, it becomes impossible to perform meaningful calculations or analyses, as there would be nothing to measure or compare against. Therefore, ensuring that all dimensions have defined members allows the application to function properly and yield accurate profitability and cost management insights.

In the context of the other options, while having only one point of view dimension might simplify certain analyses, PCMCS can handle multiple perspectives as long as they are well-configured. Requiring at least one alternate hierarchy can be beneficial for complex analyses, but it's not mandatory for validation. Deleting all previous applications isn't necessary for the validation process and could lead to loss of valuable data if not managed correctly. Thus, the emphasis on all dimensions including members is critical for ensuring that the application is robust and effective.