Conditional valuelist choice problem

[jrRaid]

I have a cond valuelistsystem, limked to 3 fields.

A choice in field1 will generate the valuelist for field2 and that for field3.

It's working well, no problem at that level.

The problem is when the values need to be changed.

When a user change the value in field1, and exit the record for whatever reason, the values in field2 and field3 are not correct. They still show the corresponding value from field1 (now changed).

Is there a way to set field2 and field3 to empty, the moment the value in field1 is changed ?

And to set field3 to empty the moment the value in field2 is changed ?