2-way association

I have 2 entities, with a many to many association. So i can now create objects and refer them to each other but im running into 1 problem: when i have entity 1, with object a,b and c in them and entity 2 with object X,Y,Z in them. And i use an input reference selector to multi select the associations for example: 1 is linked to x and y x, is linked to 1,3 when i enter association from 1 to x, an y this works, but when i open x, it is not linked to 1 yet, i have to set that up again. How can i make it that when i link 1 to x, x nows this and displays the link?
1 answers

okay allready found it, quite stupid, but it works, no i cant seem to delete this question