Creating Credit Memo Manually with Multi Lines using API

Dear All,

Im creating now a manual credit memo with multi lines but im facing a problem regarding with the lines only one lines inserted in my procedure should be 3 lines....my procedure code is below...i put the end loop after the lines not after the api procedure because if i put the  endloop after the procedure of calling api name i get the the 3 lines but the problem is different customer_trx_id and trx_number in each line separated each should be 1 customer_trx_id and 1 trx_number for this  3 lines...anybody can help me to fix this problem and i appreciate your