3789933 - BW query fails with error "could not get attribute info for <characteristic>_KEY(0)"

BW query fails with error:

undefined index attribute;undefined index attribute;object=.../[Request Info: ...  
Object Name = "<SAP schema>"."0BW:BIA:<BW InfoProvider>", FM Name = TREX_DBS_AGGREGATE]  
Error 2.957 has occurred in the BWA/SAP HANA server  
Error reading the data of InfoProvider <BW InfoProvider>$X  
Error while reading data; navigation is possible  
CL_RSDRH_TREX_STORAGE >> Row:  Inc: 114 Prog: MAP_TREX_EXCEPTION

Indexserver traces contain more information about the error:

"undefined index attribute" ... "could not get attribute info for <characteristic>_KEY(0)"

SAP BW/4HANA

"undefined index attribute" "2.957" "2957" "CL_RSDRH_TREX_STORAGE" "MAP_TREX_EXCEPTION" "Indexserver" "could not get attribute" "could not get attribute info" "<characteristic>_KEY" "_KEY" "_KEY(0)" "KEY(0)" "KEY(number)" , KBA , BW4-AE-DBIF , DB Interface Data Manager , HAN-DB-ENG-BW , SAP HANA BW Engine , Problem