Inserting NULL values using LEI

Hi,

I am using LEI 6.x with Domino R6.5 and DB2

In DB2 I have 2 tables:

EMPLOYEE TABLE, with the following columns:

Emp_ID (PK)

Emp_Name

Team_ID (FK from the Team table, can be null)

TEAM TABLE, with the following columns:

Team_ID (PK)

Team_Name

In Notes I have a form EMPLOYEE with the fields:

EmpName

EmpID

TeamID

I have set up Virtual Fields Activities to monitor the Notes form, etc.

From the tables above you can see that an EMPLOYEE is linked to a TEAM via the Team_ID. I want to be able allow users to save the EMPLOYEE record and so that when the TeamID field is empty LEI will set Team_ID to NULL in the EMPLOYEE table. How can I do this?