2.3.2.2 Role/Service Relationships
The following diagram illustrates the relationships between service and profile roles.
![](GUID-A538BEE6-C6A4-470D-A464-9506129141DF-high.png)
A Transparent Credit Based Server shall instantiate the Transparent Credit Based Service (TRCBS) [1]. As shown above, a higher layer specification is required to provide additional requirements on top of TRCBP that are specific to the need of the use case.