What is the tax source system code related to the benefits and overpayments? List the code and the benefit id, order by benefit id.
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