The task of the criminal law

The task of the criminal law

Problem 7. Individual entrepreneur Nikolaev VS appealed to the Court of Arbitration of the Omsk region with a claim to the Limited Liability Company "Salute" on collecting 25,700 rubles for goods delivered under the contract number 14 from 12.05.2002, the
The plaintiff´s claims based on the contract of sale the right to demand cash in the amount of 25,700 rubles per delivered under the contract number 14 from 12.05.2002, the product has been transferred to the original creditor (a party to the contract) individual entrepreneur Nikolaev VS 15000 rubles.
The defendant did not recognize the claim. According to him, given the contract of sale the right to demand contradicts the legal nature of the assignment, therefore, he is a prisoner in violation of applicable law is null and void due to 168 of the Civil Code.
What decision must take the arbitral tribunal?

Additional information:

solution to the problem is 2, 5 sheet