I found an error screenshot in it that is similar to the screenshot you provided, this problem is most likely caused by the following reasons: The GROUPBY data source divides the query result into groups of records, usually for the purpose of doing one or more aggregations on each group. Every GROUPBY data source can be configured so that it's run either at the database level or in memory. When a GROUPBY data source is configured so that it's run at the database level, ER checks whether a direct SQL query can be established to a data source that is referred to in that data source. If a direct query can't be established, a validation error occurs in the ER model mapping designer. The message that you receive states that the configured GROUPBY data source can't be run at runtime.
Finally, this official document offers two solutions:
Best regards,
Kevin
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