Oracle Apex - Delete from Collection

 In oracle Apex when you want to delete from a collection :

Item Name : P101_DELETE_ID

In Link add the code :

javascript:getID(&SEQ_ID.)

Link Text :

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Add the function at "Function and Global Variables" -

function getID(val)
{
apex.item("P101_DELETE_ID").setValue(val)
}

At Dynamic Action :

BEGIN
    IF :P101_DELETE_ID IS NOT NULL THEN
        APEX_COLLECTION.DELETE_MEMBER (P_COLLECTION_NAME   => 'WEMP',
                                       P_SEQ               => :P101_DELETE_ID);
    END IF;   
EXCEPTION 
  WHEN OTHERS THEN
     NULL;
END;

Add another True Action :

Refresh Region.