added check on veichle identification number uniqueness#4

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paolocappelletti wants to merge 3 commits intodevfrom vin_unique_check

+208-31

Commits on Sep 9, 2020

added check on veichle identification number uniqueness
paolocappelletti
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Commits on Sep 14, 2020

changes after codereview
paolocappelletti
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Commits on Sep 15, 2020

reverted generics declaration in CarDeclarationTransaction
paolocappelletti
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