Для операции "<var>X</var>" в контракте "<var>Contract Name</var>" уже задано поведение "<var>Y</var>", поэтому новое поведение добавить нельзя. Это обычно указывает на то, что метод IOperationSerializer.ApplyToOperation уже был вызван для данной операции.

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Operation '<var>X</var>' in contract '<var>Contract Name</var>' already has a '<var>Y</var>' behavior, so a new one cannot be added. This usually indicates that the IOperationSerializer.ApplyToOperation method has already been called for this operation.

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