PADS I/O Designer allows you to generate symbol and schematics data for exchange with external design definition tools, such as PADS Designer.
When exporting to PADS Designer, PADS I/O Designer puts PADS I/O Designer symbols on separate sheets called a reserved sheet that should not be modified. Reserved sheets contain only PADS I/O Designer symbols and nets. Connection to the rest of the schematics is guaranteed by net names. During schematics export, sheets with the IOD_RESERVED_SHEET attribute are automatically overwritten. In the remaining sheets, symbols with the IOD_GENERATED attribute are moved to a new Reserved Sheet.
All sheets are placed into separate blocks in the schematic tool. When you add a sheet inside a block generated by PADS I/O Designer, then the sheet will not have the IOD_RESERVED_SHEET attribute. PADS I/O Designer protects against deleting of this additional sheet during the symbol update process.