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believe that composite keys create a very natural and descriptive data model. My experience comes from Oracle and I don't think there is any technical issues when creating a composite PK. In fact anyone analysing the data dictionary would immediately understand something about the table. In your case it would be obvious that each source_id must have unique id_on_source.
The use of natural keys often creates a hot debate, but people whom I work with like natural keys from a good data model perspective.
