Postgresql and External type

Hi,

When I add an attribute with external type 'integer' or 'smallint' or 
'bigint' and try to generate the create table sql-statement I am 
getting the following message:

Unable to find type information for external type 'integer' in 
attribute 'age' of entity 'Author'.  Check spelling and capitalization.

If I change it to external type char or numeric - which are legal data 
types in Postgresql just like integer - EOF has no problem generating 
the create table sql.

What does it takes to also work with integer external type ?  Are any 
other known external data types EOF is picky with using Postgresql ?

Thanks ahead,
János
P.S.  I am using Posgresql 7.2.3 and Webobjects 5.1.4