OnLook up trigger validation

Dear All,

I have an onlook Trigger that is picking County based on code selection from list Post codes. That is when I select a lookup button on my page it populates both code and county in their respective fields on my page.

I have realised, when one ignores the lookup button and type one of the existing code on the code field on my page and tab, the County field ain't populated as required but the saving of the record continues. It's only when I lookup the county is populated. Is there a way the county field will be populated when ones types without looking up?.

Kindly assist.

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