It seems that you are using two DBs (db and dblc).  
In my experience,  you cannot make relationships across two distinct DBs.

Suggestion:

1. Create a set of all the lc_vw_lc_master.lc_no possibilities 
2. Create a normal string field for pm_events.lc_no with a IS_IN_SET 
validator.

If the record set for 1. is large, you can cache it.

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