In some methodologies, the practice is to move from stage to stage only by approval. In Stage/Phase 1 the documents created are known as the preliminary version. So why are the non-preliminary versions in the following stage/phase?
Once the first stage/phase is approved and the project proceeds into stage/phase 2, the same deliverables are needed, yet the originals are simultaneously required as a baseline to understand the rationale of approval. So, once the first stage/phase is approved and the project moves into stage/phase 2, the preliminary documents are frozen (made non-editable) and their contents are cloned into the live versions in stage/phase 2 for whatever edits are needed through the course of the project. Now you've got your baseline documents for reporting purposes and live documents for management purposes.