automatic allocation of stocks to sales delivery is not working on my sage X3

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Hi Team i have a challenge with Sage X3, Every time  i convert a sale Order to a delivery note i get this error https://drive.google.com/file/d/1pD5EHd7aoX7Il3Vi8nNOym__bBlQkxsl/view?usp=sharing yet i have stocks, solutions tried out stock sych but the error still persist kindly assist