Two fields, the same row should not be shown in the other field

hello

I have a problem.

Suppose…
I have two fields, both of which I “LOOKUP” to a table:
fileds:
place_from > lookup field : garage table
place_to > lookup field : garage table

When I select the place_from field, What can I do so that the same row is not displayed in place_to?

My English is very bad.
I’m sorry

You better add client side Form_CustomValidate event to check.