Sub Problem Solver in standalone mode

Sub Problem Solver fallback to integration mode if this is configured to run in standalone mode.
Standalone mode for Sub Problem Solver is not supported in Supply Optimization (Planning Engine). Indicating this mode to be used in Optimization definition with this line resulted in an error during solve:
sub_problem_solver: standalone
Planning Engine logs a warning message with this release, notifying the user that standalone mode is not supported and continues with the solve using integrated Sub Problem Solver.
Note: By default, this feature is enabled. A new role or privilege is not required to access this feature.