loosing constraint at backup

Hi there,

I have a script running frequently in development process that copy a
database from a linux os machine to another windows os.

On windows I have "PostgreSQL 8.2.4 on i686-pc-mingw32, compiled by GCC
gcc.exe (GCC) 3.4.2 (mingw-special)".
On linux: "PostgreSQL 8.2.3 on i686-redhat-linux-gnu, compiled by GCC gcc
(GCC) 4.0.2 20051125 (Red Hat 4.0.2-8)".

The script use the following commands to dump/restore:

pg_dump.exe <src_db> -i -F c -b -v -U postgres -f <bak_file> -h src_ip -p
src_port
pg_restore.exe -i -d <dst_db> -v --disable-triggers -U postgres <bak_name>

In rare cases, I found one foreign key constraint is missing on destination.

Unfortunatelly, in spite this problem happens to me since a long time, the
problem is not reproductible, and this is the reason I was reticent to post
it until now.
In the future, also I will keep the backup file to found whether the problem
is on dump or restore.

Is this problem known ?

TIA,
Sabin