I have addet (due to a misundertanding) accidetially  the web.base.url to a group. Subsequently, I wanted to delete this group, but web.base.url is not listed anymore in  parameter->system parameter. However it is not gone. Trying to add a new parameter the system tells me that the name is not unique.

Could anybody give me a hint to access the value and remove the group?

Thank you very much!

Bert