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Sales And Purchase Relational Models ?

Hi.
I have designed two relational models but I am not confirmed that they are correct or not. Please anyone tell me the correctness of my relations ?

Thanks
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how can anyone expect to be up to speed with the assumptions that your mdoesl require.
the only way Ive found over the years is to take the model into a server and put sample data in and make certain your test conditions are satisfied
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purchase orders, relational models, sales system

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