SQL & PL/SQL

Hi,

I created a synonym in USER_B for a table in USER_A.

I have given all priveleges to USER_B from USER_A.

I created a package. In that I am using this synonym. Its working fine.

Today I have seen that.. the synonym is showing as invalid.
Even I recompiled the synonym. But its still showing as Invalid in PL/SQL developer.

Here I would like to see the error message which cause the synonym invalid.
How can I see the error message.?

Thank you,
Regards,

Gowtham Sen.