Problem with Relationship between 2 tables

Hi everyone,
> I have this weird problem of MS Access.
>
> I have started working in a team, where 2 tables have
> been defined, Basic & LRS.
> The primary key of Basic i.e. Segment ID is the
> foreign key of LRS.
> Now when those 2 tables were designed, some1
> overlooked this thing.
> I want this to happen, but i cannot enforce
> referential integrity becuase some the data in the
> table does not satisfy the relationship.
> As a result i defined a new database with the same 2
> tables and also defined the realtionships between the
> two. Now the data from Basic is successfully copied,
> but from LRS it is not. It gives me errors even when
> the relationship is satisfied.
> Can ne1 help me in this.
> Thanks
> Pallavi Mahajan
>