Is the bound column of cboCustomerNumber a number field, and are Posting Date
Period and cboPostingDate date fields?

Alan wrote:
I have this code in a text box

= dsum("[Amount]", "[July 09 - On Billings and Adjustments Data Query]",
"[Customer No] = " & [cboCustomerNumber] & " AND Format([Posting Date
Period], ""yyyymm"") = '" & Format([cboPostingDate], "yyyymm") & "'")

i keep getting #error in my text box

i'm struggling to find they answer to why

the query July 09 - On Billings and Adjustments Data Query
has fields of

customer Number
posting periood date
Amount

Now i have two combo boxes on my form which the text box should look up

Customer number and Name, are bound to another table

No (for customer Number)
Name ( for customer Name

Customer Listing Table

not linked to July 09 - On Billings and Adjustments Data Query

Is this what causing my error and how do i fix it

Thanks in advanced

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