How to display caption of combo box properly when using source as database

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I have Quotation entity  I want to select Job from database without association (denormorlized) by display job name in combo box and set jobno to attribute jobno in quotation entity when I save and reopen this page combo box display jobno instead of name im not sure i have done anything wrong or it is combo box bug    
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2 answers
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Can you include a screenshot of your domain model?

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image.png

 

Here is a model

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