Recreated a couple of new parts from an original part which are identical in features but scaled different, Copied original drawings and renamed to new parts then replaced original part file with new file through sworks explorer. All dimensions in new drawings fine except on some of the section views where I want to show radii its telling me:

'the selected entity cannot be converted to a line or a circular arc'

Any ideas why its not letting me do this? The original drawing doc for original part is fine (cant help but think its because Ive replace part files in the drawings??)