full error text is
Failed to save modifications to the server. Error returned: 'OLE DB or
ODBC error: [DataSource.Error] AnalysisServices: XML for Analysis
parser: The XML for Analysis request timed out before it was
completed.
Solution in parameter ServerTimeout in server properties
also ExternalCommandTimeout must be increase
more about server settings
additional in BI Query you can specify CommandTimeout param
= AnalysisServices.Database("localhost\developer", "Analysis Services Tutorial", [CommandTimeout=#duration(0,3,0,0)])