Reverse Engineering in Designer

I am currently reverse engineering existing database objects into Designer.

When a table/view is reverse engineered, if it already exists in designer, it will just update it with the new changes.

My question is with regard to PL/SQL , if I reverse engineer a package that already exists in Designer, it will not update but create a new copy of the package. So I am then left with 2 versions of the package. Can this be stopped, changed so that it will update the existing copy only ?

(I am using Designer version 6.0.3.9.0)