I am processing cube see following results and task got failed any suggestion?

Processing Cube 'PaymentServices' failed.
Errors in the OLAP storage engine: The attribute key cannot be found when processing: Table: 'dbo_vw_PS_Fact_Disconnects', Column: 'Customer_Key', Value: '78749347'. The attribute is 'Customer Key'.

Hi MarkSubedi,
The error
"Errors in the OLAP storage engine: The attribute key cannot be found when processing"
This means SSAS could not find a record in the dimension table [table name] where column [column name] contained value [value].  Essentially, a "SELECT COUNT(*) FROM [table name] WHERE [column name] = [value]" returned zero.
It can be caused in the following scenarios.
Error ETL
Bad Processing Order
NULLs in your Fact or Dimension data
Data Collation Inconsistencies
Materialized Reference Dimensions Proessed Incorrectly
For the details and solution for this issue, please refer to the links below
http://toddmcdermid.blogspot.kr/2009/01/ssas-quick-reference-attribute-key.html
http://www.msbiguide.com/2013/01/errors-in-the-olap-storage-engine-the-attribute-key-cannot-be-found-when-processing/
https://community.dynamics.com/ax/b/axdilip/archive/2012/04/14/troubleshooting-olap-errors-in-olap-storage-engine-the-attribute-key-cannot-be-found-when-processing-table.aspx
Regards,
Charlie Liao
TechNet Community Support

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