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We're building a custom connector to an ODBC driver.
There is a specific table that is no longer working in the Sept & Oct releases of Power BI Desktop. In the August release of Power BI Desktop, it works just fine. Our connector and ODBC driver don't change (or error) when testing which seems to indicate the error is within Power BI Desktop.
The error is "Couldn't load the model schema". The underlying message is "[Expression.Error] The name '3b8566cf-af93-4ca1-b887-2dbc8b7ecee8' wasn't recognized. Make sure it's spelled correctly." That GUID is not a GUID in our system so we're assuming it is internal to Power BI.
When this error happens, the table schema does load on the relationship view. However, the table and columns are not shown on the Report view under the Fields pane.
Please let us know if we can provide additional information to help get this issue fixed or if this is a known issue.
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