change column type

[Konstantin]

Hi.

I have changed the type of column in some table from number(10) to varchar2(50). If I 
update the column manualy, I mean by SQL+, it's OK. But if I try to update the above 
column via Perl DBI with some string, I get the error 984 - cloumn not allowed here. 
If I update it via Perl DBI with some number, it's updated OK. I check the database 
and the type is varchar2(50) like I wanted it, so I can't understand what's going on. 
Can you please help me?

Thanks in advance,
Konstantin