3647497 - Error "An exception occurred in one of the data sources." when running a query in Analysis for Microsoft Office

When running a query in Analysis for Microsoft Office and changing the prompt value for the second time, get the following error message: 

-------
An exception occurred in one of the data sources. 

SAP BI Add-in has disconnected all data sources. 
If you want to restart, press the Restart button below (111006).
-------

In AO trace file (SAP Note 2129389), the following errors are recorded:
-----------------------------------
>> Arguments[0]: RFC call BICS_PROV_GET_INITIAL_STATE returned an exception: RFC_ERROR_SYSTEM_FAILURE: Field symbol has not been assigned yet. - GETWA_NOT_ASSIGNED
Bali Exception:
Error\: Provider Selection Object: Initialization Issue
-------------------------------------

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental."

• SAP Analysis for Microsoft Office 2.8
• SAP Analysis for Microsoft Office, edition for SAP Analytics Cloud 2.8
• SAP Business Warehouse
• SAP BW4/HANA
• SAP NetWeaver

GETWA_NOT_ASSIGNED, RFC_ERROR_SYSTEM_FAILURE, BICS_PROV_GET_INITIAL_STATE, Field symbol, AO, runtime error , KBA , BI-RA-AO-XLA , Excel Addin , BW-BEX-OT-OLAP , Analyzing Data , Known Error