Pivot table relationship

[matts12]

Hi I have a sample file here that I need help creating a relationship for. I want my income table to show category and income, and expense table to show company and expenses. I want to have 1 year and and 1 month slicer controlling both pivottables. I can't seem to get the relationship right as I get duplicate values error. What am I not understanding about this? Any help would be greatBook1.xlsm