What is the cmi cross reference id that is related to at least one council tax entry? List the cross reference id and source system code.
return cmis cross reference  id ;return council tax entries that #1 related to ;return number of  #2 for each #1 ;return #1 where #3 is at least one ;return source system codes of #4 ;return #4 ,  #5
['select', 'project', 'group', 'comparative', 'project', 'union']