I altered the table `Company`, modifying the column `Comp_discountrate`. Then, I create table `TQuote`, and there is an error (1215) due to `Comp_discountrate` as a foreign key constraint. Without the last line of the table defininition, it works well. How can I handle this?

```sql
Alter table Company
modify Comp_discountrate double(2,2) not null default '0.4';

create table TQuote(
    Quo_id varchar(7) not null,
    Mem_id varchar(7) not null,
    Quo_date DATETIME NOT NULL DEFAULT NOW(),
    Comp_discountrate double(2,2) not null default '0.4',
    primary key(Quo_id, Mem_id),
    foreign key(Mem_id) references Tuser(Mem_id) on delete cascade,
    foreign key(Comp_discountrate) references Company(Comp_discountrate) on update cascade
)

```