This is not a bug.
As a Content Editor or Account/Executive Manager, you do not link the products while exporting .PDPD files into E-retailer’s Online Catalog.
RPC number will be provided by E-retailer’s Web Manager.
Note:
RPC will not be transferred with a .PDPD file, even if there would a possibility to enter this number for export to the Online Catalog. This option is disabled to avoid confusion.