An Example
We'll use the following example of a customer in a municipal utility's CIS system to explain SA Relationship types:
Note the following:
• Electric service has 2 SA relationship types: energy supply and meter service.
• Gas service has 1 SA relationship type: energy supply.
• Water service has 1 SA relationship type: waste water.
• Garbage service has no SA relationship types.
Note: 
Bottom line. Service providers are related to the customer via "your" service agreement. Each service provider linked to a service agreement is defined in respect of a SA Relationship Type. This relationship is effective-dated because we care about how it changes over time.
Your relationship type is implied. The SA relationship type of "your" service agreement is implied, e.g., if you are a distribution company, "your" service agreement's implied SA relationship type is "distribution".