Supplier doesn't see questions in Bid created to an RFx
I am running a SRM 7.0.
In the portal I created an RFx with several questions an distributed it to a certain supplier. This supplier can open the invitation to the RFx, participate and create a bid. But inside the bid, the questions to the RFx are not visible. Questions on "Item"-tab are visible and enabled after clicking on "Details" -> "Questions"-tab, but cannot be answered, e.g. the answer will not be saved.
Any recommendations on that?
Thanks a lot for any help.