3475889 - Dump MESSAGE_TYPE_UNKNOWN when planning data in new line (with exit data slice)

Data slice of type Exit is active for relevant part provider.

Entering data in the new line in an input-ready query in RSRT or AO fails with below dump:

Runtime Errors         MESSAGE_TYPE_UNKNOWN
ABAP Program           CL_RSBOLAP_QV_RESULT_SET======CP
Application Component  BW-BEX-ET

Short Text
    Message type " " is unknown.

Error analysis
    Only message types A, E, I, W, S, and X are allowed.

"MESSAGE_TYPE_UNKNOWN"
"CL_RSBOLAP_QV_RESULT_SET=
"IF_RSBOLAP_RESULT_SET~SET_NEW_VALUES"

SAP BW/4HANA
SAP NetWeaver 7.x

MESSAGE_TYPE_UNKNOWN, CL_RSBOLAP_QV_RESULT_SET, exit data slice, SET_NEW_VALUES , KBA , BW-PLA-IP , Integrated Planning , Problem