Access 2016 - SQL Sum Query Doesn't Provide Sum, No errors - sql

Question

Goal / Problem
What I am trying to do is fairly simple. I have two fields, InvoiceNbr and TransAmt. In the table, there may be multiple transactions for each invoice. So I'm simply trying to sum all transactions for each invoice number so I'll have one transaction sum for each invoice number (which I can later subtract from a balance to get the remaining balance). Sounds simple, and typically is... but I'm having an issue (or bug? that DOES NOT result in an error)!
My Data
Here is a query that will give a snippet of my data:
SELECT [_MasterLog_Transactions].InvoiceNbr, [_MasterLog_Transactions].TransAmt
FROM _MasterLog_Transactions
GROUP BY [_MasterLog_Transactions].InvoiceNbr, [_MasterLog_Transactions].TransAmt
HAVING ((([_MasterLog_Transactions].InvoiceNbr)="16081702014741")
AND (([_MasterLog_Transactions].TransAmt)>0));
This results in:
InvoiceNbr TransAmt
16081702014741 $1,096.73
16081702014741 $3,668.25
If I add a 'totals' row using the Access GUI, and choose "SUM", it correctly calculates "$4,764.98". And for other random reference, in the _MasterLog_Transactions table, TransAmt is a 'number' field, field size 'double', and format 'currency' -- so it should be capable of being used with the SUM function.
My Query
So working from the above data, I created the query:
SELECT [_MasterLog_Transactions].InvoiceNbr,
Sum([_MasterLog_Transactions].TransAmt) AS MyTest
FROM _MasterLog_Transactions
GROUP BY [_MasterLog_Transactions].InvoiceNbr
HAVING ((([_MasterLog_Transactions].InvoiceNbr)="16081702014741"));
My Query Results
InvoiceNbr MyTest
16081702014741 $1,096.73
I would have expected:
InvoiceNbr MyTest
16081702014741 $4,764.98
No errors occur. It runs and Access seems to think it is outputting the proper result.
Am I overlooking something really simple here, or is this an Access bug I've never run into? Any help would be greatly appreciated! Thanks.

Answer 1

Please check for space in the InvoiceNbr.
You can verify that this is an InvoiceNbr issue by adding COUNT(*) to your query.

Answer 2

I think the equivalent query would look more like this:
SELECT t.InvoiceNbr,
Sum(t.TransAmt) AS MyTest
FROM _MasterLog_Transactions as t
WHERE t.InvoiceNbr = "16081702014741" AND
t.TransAmt > 0
GROUP BY t.InvoiceNbr;
I'm guessing your real summarized data looks like:
InvoiceNbr TransAmt
16081702014741 $1,096.73
16081702014741 $3,668.25
16081702014741 -$3,668.25
That is the condition [_MasterLog_Transactions].TransAmt > 0 is filtering out key values.