Edit section of existing beams

[juliencarnot]

Sometimes, plans change and I'd like to be able to edit the section dimensions, for example switch from 145 * 45 to 120 * 45. Once you add the beam, the only way to change its section is to edit the underlying wire, but I can't seem to make the beam recompute on this base. The report shows this message:

16:12:16  GuiCommand: Edit
16:12:24  Traceback (most recent call last):
  File "/tmp/.mount_FreeCAWsnka7/usr/Mod/Arch/ArchStructure.py", line 651, in execute
    extdata = self.getExtrusionData(obj)
  File "/tmp/.mount_FreeCAWsnka7/usr/Mod/Arch/ArchStructure.py", line 780, in getExtrusionData
    f = Part.Face(w)
<class 'Part.OCCError'>: Failed to create face from wire 

Any way to do this without redrawing all the beams? Thanks for any help!