Compare two tables and return the lines that doesnt match but allow for a tolerance of 1 dollar

[MegaOctane1]

i have two tables with Inovicenumber, date and amount.
I compare the two tables, and get a result. But because of minor differences in amounts, the invoices still show up in the list. how can i get this to return only those with amount difference <>1 usd?

My DAX function:

InvoiceDifferences = 
    VAR __Table1 = SELECTCOLUMNS(Table1, "InvoiceNumber", [InvoiceNumber], "Amount", [Amount], "Date", [Date])
    VAR __Table2 = SELECTCOLUMNS(Table2,  "InvoiceNumber", [InvoiceNumber], "Amount", [Amount], "Date", [Date])
    VAR __Table1Except = EXCEPT(__Table1, __Table2)
    VAR __Table2Except = EXCEPT( __Table2, __Table1)

    VAR __Result = 
        FILTER(
                UNION(
                ADDCOLUMNS(  __Table1Except, "Source", "Table1"),
                ADDCOLUMNS( __Table2Except, "Source", "Table2")
            ),
        [Amount] <> 0 
        )
RETURN
__Result

[v-yifanw-msft · Accepted solution]

Hi @MegaOctane1 ,

Based on the information you have provided, I have created the following example to help you solve the problem and you can follow the steps below:
1. Append two tables and differentiate the data of the two tables, add an index column.

2. Add two columns.

Table2difference = 
VAR _moverows =
    CALCULATE (
        COUNTROWS ( 'Table1' ),
        FILTER ( 'Table1', 'Table1'[Source] = EARLIER ( Table1[Source] ) )
    )
VAR _amount1 =
    CALCULATE (
        MAX ( 'Table1'[Amount] ),
        FILTER ( 'Table1', 'Table1'[Index] = EARLIER ( Table1[Index] ) - _moverows )
    )
VAR _difference =
    ABS ( 'Table1'[Amount] - _amount1 )
RETURN
    _difference

InvoiceDifferences = 
VAR _moverows =
    CALCULATE (
        COUNTROWS ( 'Table1' ),
        FILTER ( 'Table1', 'Table1'[Source] = EARLIER ( Table1[Source] ) )
    )
VAR _amount1 =
    CALCULATE (
        MAX ( 'Table1'[Table2difference] ),
        FILTER ( 'Table1', 'Table1'[Index] = EARLIER ( Table1[Index] ) + _moverows )
    )
RETURN
    IF ( 'Table1'[Source] = "Table2", 'Table1'[Table2difference], _amount1 )

3. Filter results with Flag=1.

Final output:

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Best Regards,

Ada Wang

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