How to change floor plan cut definition?

[YONGWOO KIM]

I want to change floor cut plan using api.

But it's not work.

API_FloorPlanCutDefinition floorPlanCutDefinition;
GSErrCode testErr = ACAPI_Environment(APIEnv_GetPreferencesID, &floorPlanCutDefinition, (void*)APIPrefs_FloorPlanCutPlaneDef);
floorPlanCutDefinition.currCutLevel += 1;
testErr = ACAPI_SetPreferences(1, sizeof(API_FloorPlanCutDefinition), &floorPlanCutDefinition);

testErr is 0. But current cut level is not changed.