how to debug a procedure which has an object type as parameter in oracle?

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Oracle

CREATE OR REPLACE FUNCTION abc(
i_SERVICE_DETAILS IN T_ser_dtls,
0_SERVICE_DETAILS OUT xmltype;
) RETURN NUMBER
AS
var1 varchar2(30);
........
........
begin
body of the fun
end;
/

CREATE OR REPLACE
TYPE "T_ser_dtls"
(
ID VARCHAR2 (50),
CODE VARCHAR2 (3),
SERVICE VARCHAR2 (10),
C_TYPE VARCHAR2 (1)
) NOT FINAL;
/

i want to debug the above function by passing the respective values of type how to do that?