Yes, the nature or type of an enterprise can change altogether the category into which a particular activity may be classified. This can be better understood with the help of an example of two firms. One engaged in real estate and the other engaged in general business.
For the firm that is engaged in real estate business purchase and sales of building will be part of the operating activity on the other hand firm that is engaged in general business purchase and sales of building will be part of the investing activity. Hence it can be said that the classification of activities depends on the nature and type of enterprise.