Hi @Comanchi ,
Thanks for posting here. Regarding your question, the reason that you will get the sum of all the items is the relationship between Fact and Dimension has not been create, please go back to your SSAS project and set the relationship for these two tables.
create-a-relationship-between-two-tables-ssas-tabular
If you are using SSAS multidimensional mode, please refer to below document to create relationship.
lesson-5-defining-relationships-between-dimensions-and-measure-groups
Regards,
Zoe
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