Type LongInt And DbMemo

Platform :
Delphi 1.2 16bits
Oracle V 7.3.2
SQL Links 16bits v2.5

When i want to save data in long type the BDE return the following Error
: "ORA-02005 implicit(-1) length no valid for this bind or define
The column with long type store data in "Memo type".
I've use a DbMemo for access to the data in long type.
I can edit a value, but i can't save new or modified values.
The error appear at the post method.

In Delphi 2.0 with Sql Links 32 bits, this error not exist.

Can you help me .

Thanks for your time