You cannot use a nested repeating group view in an export (or import) view of a procedure step packaged as a cooperative load module. If you do either a consistency check before generation or during you should see this error:
ICCBR13E A Procedure Step with either window or cooperative packaging must not contain nested repeating group views in its import or export view set.
Common action blocks used by a cooperatively packaged procedure step are not subject to this restriction.