ModuleStudio - Error with my app

[KratorD]

Hello.

I've built a simple user rewards app (ZK3.0). It has two entities, badge and userBadge, that need to be linked together (a userBadge has n badges).
If I insert the app as is, it has several errors that I've already fixed, but there's one that's due to the relationships that I don't know why it happens.
"Property TdM\RewardsModule\Entity\UserBadgeEntity::$userBadge does not exist"
Can someone tell me what I'm doing wrong in ModuleStudio (related to this error in the relationship)?
I have attached mostapp file and module compress.
RewardsModuleStudio.zip
RewardsModule.zip

[KratorD]

It seems that it was a problem with some cache, I uninstalled the app, cleared the cache and tried again and I no longer have the error.
However, it seems that I have not defined it as I expected. It is the badge entity that is showing me to select the user, instead of the user entity being able to select the badge.

[KratorD]

In the relationship, I have exchanged the source and the target and that's it.