Stored procedure call working on one server but not on another

I have 2 servers
the old one is running 9.2.0.1.0 on Red Hat Linux

I login as STEST, both scripts below work

this one:
DECLARE a VARCHAR(100);
begin
STEST.GETNEXT_ID('ABC',1,a);
end;

as well as this one;
DECLARE a VARCHAR(100);
begin
GETNEXT_ID('ABC',1,a);
end;

Another server is running 9.2.0.3.0 on Windows
Again, I login as STEST,

the first script fails:
DECLARE a VARCHAR(100);
begin
STEST.GETNEXT_ID('ABC',1,a);
end;
ORA-06550: line 3, column 9:
PLS-00302: component 'GETNEXT_ID' must be declared
ORA-06550: line 3, column 1:
PL/SQL: Statement ignored

but the second one works all right
DECLARE a VARCHAR(100);
begin
GETNEXT_ID('ABC',1,a);
end;

Any ideas?

TIA