power bi reference source renamed/chanced - error on syntax

Hi

let's say i have a new pbi; when i choose a folder source - combine&edit it appears up on the left side this 

and it takes a reference source

the problem is later when this reference source is no more on that folder

pbi looks after its name and returns an error because it don't find it.

How can i make pbi to be versatile and not take in consideration a name source as reference which can be or not later; think on this situation: this year i use 3 excels sources named 2016, 2017 and 2018 and the reference is one of them let's say 2016; next year i will have other years data than this reference 2019,2020 and 2021. i don't want to give me an error when the refference dissapears, the structure of the data is the same on all excels.

thanks,

Cosmin