The hypothecary subjective law is established with the aim of guaranteeing the satisfaction of the liability of the hypothecary creditor. In this connection it is important to determine the size of the promissory note on which the juridical effect of the guarantee, established by the subjective hypothecary law, is extended. For this it is necessary, first of all, to determine the correlation between the content of the guaranteed promissory and the its size (the material value), and in the second, the correlation between the legitimizations provided by the Civil Code of the Republic of Moldova and those of the Law nr. 142/2008, concerning mortgage, in order to achieve a uniform solution of the afferent issues.