When is a lawsuit dismissed due to the defendant's lack of legal standing in commercial transactions related to legal entities?

The lawsuit is dismissed due to the defendant's lack of legal standing if it is proven that the original transaction was with a natural person in their individual capacity as the owner of a sole proprietorship, and there is no evidence of the transfer of the debt or obligation to the liability of an independent legal entity (such as a Limited Liability Company), which means that the legal entity lacks standing in the lawsuit related to those transactions.