cursor issue with for update in sap hana

Hi,

In stored procedure i am using cursor for select statement with for update. 

insert into table1 values ('1','a','b');

insert into table1 values ('1','a','c');

insert into table1 values ('1','b','b');

insert into table1 values ('1','d','b');

Ex: define cursor c_cur for select col1,
                                                col2,
                                                 col3
                                        from table1
                                        where col1 = '1'
                                        for update;

for r1 as c_cur do
v_count := v_count + 1;
end for;

In Table1, no of rows - 4
but getting v_count = 5.

For loop is running twice for first record.

How to avoid this issue?

i am using SP6 64 bit HANA studio and client - rev 61.

Thanks.