When you save a model in a IBM Rational ClearCase directory (under source control), it is assigned a name in lowercase letters. When you connect it to an archive, IBM Rational Rhapsody® creates the directory with an uppercase name. The file <project>.rpy is lowercase and the directory <PROJECT>_RPY in uppercase, which does not work in Rational ClearCase.
If this setting is not changed and a project name has uppercase characters, then, in some cases, Rational ClearCase is not able to find the correct _rpy files.