When configuring the scenario for two envelope bidding, it is necessary to add RFX transaction types in SPRO customizing SPRO -> SRM Server -> RFx -> Extended RFx Process -> Two-Envelope RFx Response -> Define Basic Data for Two-Envelope RFx Response.
However, it is noticed that when adding and saving entries in this customizing, they are not saved after leaving the screen.
Actually there is a missing step that is needed to configure before adding entries in Define Basic Data for Two-Envelope RFx Response.
RFX transaction types configured in SPRO -> SRM Server -> RFx -> Extended RFx Process -> Tendering Options -> Define Tendering Options must be flagged as "TwoEnv.RFx" in order to be able to save entries in Define Basic Data for Two-Envelope RFx Response.
After flagging this check box in Define Tendering Options, it will be possible to add and save entries in Define Basic Data for Two-Envelope RFx Response.
See more information in KBA 2006132.