No luck as ... ?

Note that DSum accepts expression, so, instead of two DSum, you can use just
one (which could be faster):

DSum("[Purchase]","Inventory Movement
Extended","[InvoiceNumber]='" & [InvoiceNumber] &
"'")-DSum("[Sale]","Inventory Movement Extended","[InvoiceNumber]='" &
[InvoiceNumber] & "'") AS Balance

can be changed to

DSum("Nz(Purchase,0) - Nz(Sale,0)","Inventory Movement
Extended","[InvoiceNumber]='" & [InvoiceNumber] &
"'") AS Balance


But what is the problem, exactly? If you have a dateTimeStamp field, maybe
it would be safer to use it, instead of the InvoiceNumber.


Vanderghast, Access MVP

"Abdul Shakeel" wrote in message
...
I am using the following query to create running balance at every change of
Invoice Number but no luck, here Invoice Number is a text field

SELECT [Inventory Movement Extended].InventoryCode, [Inventory Movement
Extended].InvoiceDate, [Inventory Movement Extended].InvoiceNumber,
[Inventory Movement Extended].[Company Name], [Inventory Movement
Extended].InventoryName, [Inventory Movement Extended].Purchase,
[Inventory
Movement Extended].Sale, DSum("[Purchase]","Inventory Movement
Extended","[InvoiceNumber]='" & [InvoiceNumber] &
"'")-DSum("[Sale]","Inventory Movement Extended","[InvoiceNumber]='" &
[InvoiceNumber] & "'") AS Balance
FROM [Inventory Movement Extended];

any suggestions!!!

--
Regards,

Abdul Shakeel