DAX wrong total

Hi  sabd80,

Here are some steps you can follow to troubleshoot the issue:

Here are my test data:

1.Create a measure

Testing Step 2 Cash Improvement =
ROUNDUP (
    SUMX (
        SUMMARIZE (
            'Supplier Spend Analysis',
            'Supplier Spend Analysis (2)'[3.Step 2 DPO Days Move Each Supplier]
        ),
        3000000 * 'Supplier Spend Analysis (2)'[3.Step 2 DPO Days Move Each Supplier]
    ),
    0
)

2.Final output

In order for you to solve the problem faster, you can refer to the following documentation

How to Get Your Question Answered Quickly - Microsoft Fabric Community

Best Regards,

Albert He