Hi stajkov,
The current split points are always automatically memorized to Registrations (style and left split point with the "Style" checkbox, Right3 split point with the "Voice" checkbox). The only way to lock the current Split Points is to tick "Split Point" in the Parameter Lock display. (Close the Parameter Lock display by pressing EXIT to save the settings). Then the split points can only be set directly in the Split Point display, i.e. no longer via Registrations.
Best regards,
Chris