Rotate a vessel

In FRCalculator a cylindrical body is assumed placed in front of two vertical walls forming a right angle (see attached figure).
How can I rotate one of the two walls so that the angle between them is less than 90 degrees?
Is it through the Vessel Position card? If so the option to select rotation angle is locked..

Hi,

yes, recently, the rotation angle is locked. You could change the *.grd file itself so that it represents an oblique wall.