Using property sync inside property sync

i created one field in custom object as A, i used the same field using Property sync in standard object B , now i’m trying to use the same field from B inside a custom ojbect field of an other standard object C if i try to do so i’m getting error why?

i created one field in custom object as A, i used the same field using Property sync in standard object B , now i’m trying to use the same field from B inside a custom ojbect field of an other standard object C if i try to do so i’m getting error why?