Pivot Table filter is not working as expected

In the attached workbook you will see that there are negative values for some customers in the pivot table.

In a previous thread I was helped with how to display only customers with a value in Sum of Overdue which worked OK. However, I now need to eliminate these negative values. Setting the Sum of Overdue filter as Greater Than 0 does not work for me.

I would greatly appreciate any help please.

Have you considered using a helper column with an If test to replicate the overdue numbers that are >0?

Thanks for your suggestion Richard. I've solved it by removing negatives from the data in the Overdue column in the invoices table. Much better data mangement!!!