Spanish to English Law/Patents Certificates, Diplomas, Licenses, CVs

Hi,

I'm having trouble figuring out how to translate "No. 530" in a Salvadoran birth certificate in a way that makes sense within the context of the sentence. My main confusion is trying to figure out what the "no. 530" is referring to. Is it the number of the marginal note? At the top of the birth certificate it says "No. 530103," so maybe it is referring to the number of the birth certificate?

Original: "En el libro de marginación se encuentra la razón que dice: No. 530, margínese la partida de nacimiento de XXX, inscrita en la partida número 910..."
My attempt: "The book for additional notes states: No. 530, marginal notation is added to XXX's birth certificate, recorded in the certificate number 910..."

The way I currently have "No. 530" doesn't make a lot of sense in the sentence. If the number refers to the marginal notation, I could write "...margination notation no. 530 is added to..." Thanks for the help!