Data transfer problem between Oracle 9 and Oracle 8

We have two enviroments one in oracle 9 and other is oracle 8, both are on different unix servers.
There is a DBlink for Oracle 8 on the oracle 9 database. Now when we try to select any data from oracle 9 and insert into oracle 8 using the dblink all the VARCHAR or CHAR values are going as null.
For example if we try the following sql:
INSERT INTO oracle8table@dblink (col1_varchar,col2_num)
SELECT col1_varchar,col2_num FROM oracle9table
all the col1_varchar are populated as NULL, however the col2_num is getting populated correctly.
The data type of both the columns are identical.
Any help on this highly appreciated.
Thanks

How about posting the table structures just to make your post more clearer and avoid ambiguity ?
Just a matter of thought it is always better to pull the data rather than push the data. For e.g. in oracle you cannot use direct path insert while pushing the data but you can use direct path insert while pulling data.
Regards
Raj

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