code: public boolean isUndefined(final Field destination,final Field source) {
  		
  		info = null;
  		
  		for (IOperationAnalyzer analyzer : analyzers) 
  			if(analyzer.verifyConditions(destination,source))
  				info = analyzer.getInfoOperation(destination, source);
  		
  		// if the operation has not been identified
  		if(isNull(info)) info = undefinedOperation();
  		
  		boolean conversionMethodExists = conversionAnalyzer.fieldsToCheck(destination,source);
  		
  		OperationType operationType = info.getOperationType(); 
  			
  		if(operationType.isUndefined() && !conversionMethodExists)return true;
  		
  		if(conversionMethodExists)                  // explicit conversion between primitive types
  			info.setInstructionType(operationType.isBasic()?OperationType.BASIC_CONVERSION
  													// explicit conversion between complex types
  			                         			   :OperationType.CONVERSION);
  		return false;
  	}
docs: This method analyzes the fields, calculates the info and returns true if operation is undefined.
  @param destination destination field
  @param source source field
  @return returns true if an operation between fields exists
  @see InfoOperation