8.03.4XX User Defined Tables

I'm just starting to look at user defined tables. What I would like to do is use the table "UD01" and create a form based off this table. I am able to get the form created, but what I need to do is have the primary key (Key1) for the user defined table be equal to an existing part in the system. So when a new record is created in the user defined table, Key1 needs to match an existing part in the system, if there isnt a matching part in the system I would need an error message that would prevent the record from being created. Has anyone attempted to do something like this? Any ideas?
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Thanks,

Dustin Biniek
UMC, Inc.
DustinB@...




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