When processing SSAS Data Mining Structure which is based on a Cube (DataSource is Used as Cube) in such a case Analysis Services uses service Startup Account while processing Mining Structure.

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If Analysis Services Startup Account doesn’t have Full Permission on OLAP Cube then processing will fail with below mentioned error:

Errors and Warnings from Response
Internal error: The operation terminated unsuccessfully.
OLE DB error: OLE DB or ODBC error: The UseTransaction and MasterTransaction request properties are reserved for database administrators..
Errors in the OLAP storage engine: An error occurred while processing the 'Internet ~1 ~MG' partition of the 'Internet ~1 ~MG' measure group for the 'Customer Clusters ~MC' cube from the Adventure Works DW 2008R2 database.
Server: The operation has been cancelled.
Errors in the OLAP storage engine: An error occurred while processing the '~CaseDetail ~MG' partition of the '~CaseDetail ~MG' measure group for the 'Customer Clusters ~MC' cube from the Adventure Works DW 2008R2 database.

To work around this issue -
Ensure that <ServiceAccountIsServerAdmin> Property in msmdsrv.ini file is set to 1 (True)
Default - Location of msmdsrv.ini file (C:\Program Files\Microsoft SQL Server\MSAS10_50.SQL2008R2\OLAP\Config)
Or
Create a Role in Database – Grant Full Control to this Role and Add Service Account Member of this Role