T-SQL case nested case

SELECTJournalentryid, Journalentryno, Capitalchain, DataSource, Entrysummary, Accountsubject, CaseAccountsubject when ' Accounts payable '  Then ' Carmen network supplier '          when ' Accounts receivable '  Then ' Carmen Customer '          when ' prepayments '  Then( Case                               whenJournalentryno like ' api% '  Then ' API prepaid customer '                               whenJournalentryno =' CSC004 '  Then ' csc advance customer '                               whenJournalentryno =' CSC005 '  Then ' Carmen Prepaid customers '                               whenJournalentryno like ' kys% '  Then ' card bar 0 customers in advance '                               whenJournalentryno like ' zh% '  Then ' Carmen Prepaid customers '                               whenJournalentryno like ' zjc% '  Then ' Carmen Prepaid customers '                            END)ELSE "'       END  asAccountsubjectdetail, debitamount*-1  asDebitamount, creditamount*-1  asCreditamount, Offsetcategory, Customersitetype, Businesstypeid, Journalentrytime, Inputtime fromDbo. JournalentryWHEREJournalentrytime >=' 2015-08-23 00:00:00.000 '        andJournalentrytime <=' 2015-08-23 23:59:59.999 '        andAccountsubjectinch(' Accounts receivable ',' Accounts payable ',' prepayments ') andCustomersitetype =' external site '

T-SQL case nested case