Question: What is the tax source system code related to the benefits and overpayments? List the code and the benefit id, order by benefit id.
SQL: SELECT T1.source_system_code ,  T2.council_tax_id FROM CMI_Cross_References AS T1 JOIN Benefits_Overpayments AS T2 ON T1.cmi_cross_ref_id  =  T2.cmi_cross_ref_id ORDER BY T2.council_tax_id