(13)Micro-undertakings have limited resources with which to comply with demanding regulatory requirements. Where no specific rules are in place for micro-undertakings, the rules applying to small undertakings apply to them. Those rules place on them administrative burdens which are disproportionate to their size and are, therefore, relatively more onerous for micro-undertakings as compared to other small undertakings. Therefore, it should be possible for Member States to exempt micro-undertakings from certain obligations applying to small undertakings that would impose excessive administrative burdens on them. However, micro-undertakings should still be subject to any national obligation to keep records showing their business transactions and financial position. Moreover, investment undertakings and financial holding undertakings should be excluded from the benefits of simplifications applicable to micro-undertakings.