BBO Invoice can only be indexed into using square brackets or the index function

Certified Associate Developer

i'm trying to get the billNo of this invoice object 

 but when i try to retrive it  i get null values if  i use  the index function  if i don't use index function i get an error saying the error that i just wrote in the subject  the only way for me to get this information is just getting all    the values  how could i  get just one value ? bellow i'm gonna let you some examples of  what i see.

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