Each Silk Central database must have a unique repository ID. This ID is used in ALM URIs to uniquely identify Silk Central requirements and tests across multiple Silk Central repositories. The repository ID must be unique within your company's Silk Central installations. The supplied repository ID will be part of the ALM URI. For additional information on ALM URIs, see ALM URIs. It is good practice to use a descriptive ID, for example USCA01, for USA, California, repository #01 or GEBE02, for Germany, Berlin, repository #02. Allowed characters are letters, numbers, period (.), and minus (-). IDs must have a length of 1 to 20 characters.