# Unknown entrry in many to many relation

**URL:** <https://forum.adalo.com/t/unknown-entrry-in-many-to-many-relation/13502>\
**Category:** Database\
**Created:** [June 7, 2021, 2:54pm UTC](https://forum.adalo.com/t/unknown-entrry-in-many-to-many-relation/13502 "2021-06-07T14:54:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rakesh](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.adalo.com/rakesh/32/8318_2.png) [@Rakesh](https://forum.adalo.com/u/Rakesh)\
**Post date:** [June 7, 2021, 2:54pm UTC](https://forum.adalo.com/t/unknown-entrry-in-many-to-many-relation/13502/1 "2021-06-07T14:54:30Z")

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I have one collection many to many relation.  
Example  
User and category.  
So if category is entered in to user then in category user data is entered as unknown.  
What would be the issue.