The attached document contains the macro “Change Shape via Matrix”. It reads the
property “Transformation” from the selected shape, multiplies it with a
60°-rotation matrix (mathematically 60° = UI 300°) and writes the result back to
the property. When applying the macro, the shape should perform a 60°-rotation.
Set a break point in the macro “Examine shape” and watch the object “oShape” to
see this property.

Select the group object. Set it in rotation mode and drag a red corner handle.
Watch that the group object is capable of rotating.
Reload the document and select the group object. Now apply the rotation matrix
by clicking on the icon "Change Shape via Matrix". The group does not rotate.