In HTML5 and Silverlight, in the Help Center, there is the possibility to add company specific help documentation in Company Specific Help. This functionality doesn't appear in RUI. There is only a Help button with a link to the SAP Help Portal. This is a current limitation in RUI. According to the SAP Help Portal "We do not have Help Center search. When you click the search icon it launches the product help portal page."
Please refer to the link in the See Also section.
Reproducing the Issue
When in RUI go to the menu in the top right of the screen.
From the menu select Help.
You will be presented with the SAP Help Portal rather than the usual Help Center from other UI.
RUI currently does not support Help Center search.
Currently to access the Help Center you must still go to Html5 or Silverlight.
SAP Help Portal:
KBA , SRD-CC-FED , Feeds , Product Enhancement