Understanding Society User Support

Hello,

In the file a_natchild the variable a_childno records every child listed by a given adult. However, some of those children listed by the same adult share the same identifier code (a_lchno). That is, there are repeated children identifier codes for a given adult (repeated observations with identifers a_hidp a_pno a_lchno). Is there something am I missing or is it an error?
This is something that occurs too in the file a_adopt.

Thank you very much in advance.

Paulino