Certain symbols can not be added to an IBM Rational System Architect XT (SA/XT) diagram
The symbols in question are greyed out in the toolbar and can not be added using SA/XT
This happens when the symbol in question has a definition that contains a property using the keyword: REQUIRED
Resolving the problem
This restriction is part of the tool's design. However, if you must have access to the symbol, you can remove the REQUIRED keyword from the definition property.