PL/SQL :: Procedure To Merge / SELECT From Table Of Record

I want to write a simple stored procedure and I want to keep it as simple as possible (no loop, the least amount of parameters ...etc.)

Basically, the procedure receives a Table Of Record as input parameters and needs to merge it with existing table, the table of record is of the rowtype of the existing table.

I have difficulties to merge these data. Below is what I tried

CREATE or REPLACE PACKAGE BIZ_xxx_MERGE
IS
TYPE xxx_ACTIVITE_Type IS TABLE OF MyTbl%RowType INDEX BY BINARY_INTEGER;
PROCEDURE MERGE_xxx_ACTIVITE_SP (
MyLP IN xxx_ACTIVITE_Type
);
END BIZ_xxx_MERGE;

CREATE OR REPLACE PACKAGE BODY BIZ_xxx_MERGE AS
PROCEDURE MERGE_xxx_ACTIVITE_SP (
MyLP IN xxx_ACTIVITE_Type
) AS
BEGIN
MERGE INTO MyTbl
[code].........