changing value on recordset gives error 1009

i have a form , based on a selection query, on the form i have a total per order  which is the sum of al subrecords .
O n the form (and in the table) i have a field, "niet factureren" , i have made an event behind the field so that all undelying records are updated

If niet_factureren (field name) = Null Or 1 Then
strsql = "Update dbo.printopdrachten Set [niet factureren] = 1 WHERE Opdrachtnr = " & Me![Opdrachtnr]
DoCmd.RunSQL (strsql)
Else
strsql = "Update dbo.printopdrachten Set [niet factureren] = 0 WHERE Opdrachtnr = " & Me![Opdrachtnr]
DoCmd.RunSQL (strsql)
End If

if i run the code then i get the message 1009 and the message that an other person has changed the data, (code) , but i can not accept the changes.

the recordsource is

SELECT DISTINCT Naam, Opdrachtnr, SUM([te factureren]) AS [te factureren], Omschrijving, afgedrukt, gebruiker, datum, gefactureerd, pdf, [niet factureren]
FROM         printopdrachten
GROUP BY Naam, Opdrachtnr, Omschrijving, gebruiker, datum, factuurinorde, afgedrukt, gefactureerd, pdf, [niet factureren]
HAVING      (gefactureerd = 0) OR
                      (gefactureerd IS NULL)
timohornAsked:
Who is Participating?
 
timohornConnect With a Mentor Author Commented:
@fyed

That won't work because i have 1 order number, but multiple subrecords,
i show the running total, so if i want to update the value then i have to update all underlying record.
example
Naam      Opdrachtnr      OpdrachtRegelID      factuurinorde      te factureren      Omschrijving      afgedrukt      gebruiker      datum      gefactureerd      pdf      niet factureren
IKo Nederland      13024798      63945            € 0,00      IKo FAMILY TRAINING                              Onwaar      Onwaar
IKo Nederland      13024798      63946            € 2,10      IKo FAMILY TRAINING                              Onwaar      Onwaar
IKo Nederland      13024798      63947            € 0,96      IKo FAMILY TRAINING                              Onwaar      Onwaar
IKo Nederland      13024798      63948            € 180,60      IKo FAMILY TRAINING                              Onwaar      Onwaar
IKo Nederland      13024798      63949            € 523,80      IKo FAMILY TRAINING                              Onwaar      Onwaar

so i have to update all underlying records, but then they won't show.
0
 
Dale FyeCommented:
start off by changing :

If niet_factureren (field name) = Null Or 1 Then

to:

If NZ([niet_factureren], 1) = 1 Then
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Dale FyeCommented:
first off, you cannot compare the value of a field or control to NULL using the equals operator.  You can do:

IF IsNull([niet_factureren]) OR [niet_factureren] = 1 then

or you could do as I indicated above:

IF (NZ([Niet_factureren], 1) = 1 then

But chances are that the problem is that you are trying to update (via SQL) a field that is locked because it is being edited on your current form.  Why are you not just updating the [niet_factureren] control value in the current form:

me.[niet_factureren] = IIF(NZ([niet_factureren]), 1) = 1, 1, 0)
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timohornAuthor Commented:
Solved it by changing the underlying record set
0
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