Error while setting prBoundary points after adjusting top and bottom offsets

I want to stretch the prBoundary by adding an offset of -0.05 to the bottom side and 0.05 to the top side. Currently, the bottom side is at 0.0 and the top side is at 1.4.

Code:

procedure(setBBox()
let( (cv x0 x1 x2 x3 y0 y1 y2 y3 point obj)
cv = geGetEditCellView()
obj = cv~>prBoundary
when(obj
point = obj~>points

; First point
x0 = car(car(point)) ; x of first point
y0 = cadr(car(point)) ; y of first point
; Second point
x1 = car(cadr(point)) ; x of second point
y1 = cadr(cadr(point)) ; y of second point

; Third point
x2 = car(caddr(point)) ; x of third point
y2 = cadr(caddr(point)) ; y of third point

; Fourth point
x3 = car(cadddr(point)) ; x of fourth point
y3 = cadr(cadddr(point)) ; y of fourth point

printf("Original BBox: ((%f %f) (%f %f) (%f %f) (%f %f))\n" x0 y0 x1 y1 x2 y2 x3 y3)
obj~>points = list(list(x0 -0.05) list(x1 1.45) list(x2 1.45) list(x3 -0.05))
)))

CIW Message:

Original BBox: ((0.000000 0.000000) (0.000000 1.400000) (0.540000 1.400000) (0.540000 0.000000))
*** Error in routine setSGq:
Message: *Error* setSGq: (DB-370034): dbSetq: Cannot set attribute - points


Could you please help me on this
As I'm using the Cadence Virtuoso IC23.1 version