[Zope] Pb with publication

We use zope 1.10.2 (under linux Red hat 5.2 with Apache 1.3.3) and we publish html pages with communicator (composer v4.03 or 4.5 under windows 98). When publishing pages which names already exists in the Zope hierarchy, this documents can not be see in the hierarchy browser. In fact these pages overwrite those which have the same name higher in the hierarchy whithout any warning message. Any idea ? What is the solution to delegate publishing with that problem ?