# ID 120370

Selecting/deselecting spline interpolation not permitted while free-form surface mode is active.
Description | When the HSC function (#HSC[]) is active, it is not permitted to also select Akima or B spline interpolation with the (G151) command or to deselect these functions using the (G150) command. For more information on spline functions, see [PROG// Section: Akima spline interpolation]
.[PROG// Section: B spline interpolation].

Response | Class | 2 | Program abort.
Solution | Class | 6 | Before selecting the spline function, deselect the HSC function via #HSC[OFF].
Error type | 1, Error message from NC program.