CREO drawing sheet Overlay problem, with datum symbol

When I add an overlay sheet or view, at the beginning , seems to work. after the check-in, if you close and erase not display, when you open again the drawing that contain the Overlay, the result is some DATUM with large rectangle, and this result also in the publication of Windchill.

Only if I open in my session the source drawing and after I regenerate the target drawing, the problem will solve.

But taking in to account that after the check-in the cad worker will retrieve only the target drawing, so the problem will reflect after in windchill.