error 2471

thisis a  validation i try to do in Access form

i do not know why it give me error 2471 in the form


If Me.amount > DLookup("totalvalue", "po_1", "[PO_oracle]= " & Form_GR_trans.POoraclenum)
mmouslyAsked:
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mbizupCommented:
Try this - NZ handles cases where there are no matches by returning 0 instead of null:

If Me.amount > NZ(DLookup("totalvalue", "po_1", "[PO_oracle]= " & Form_GR_trans.POoraclenum),0)

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Ot if PO Number is text enclose it in quotes:

If Me.amount > NZ(DLookup("totalvalue", "po_1", "[PO_oracle]= '" & Form_GR_trans.POoraclenum & "'"),0)

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Jim Dettman has an EE Article that does a very good job of explaining the DLookup function here:
http://www.experts-exchange.com/Microsoft/Development/MS_Access/A_12-Dlookup-and-the-Domain-Functions.html
mmouslyAuthor Commented:
hi  mbizup

it does not work it turn ren , i used the one related to text po
mbizupCommented:
Make sure it is all on one line:
If Me.amount > NZ(DLookup("totalvalue", "po_1", "[PO_oracle]= '" & Form_GR_trans.POoraclenum & "'"),0)

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Also try this:

If Me.amount > NZ(DLookup("totalvalue", "po_1", "[PO_oracle]= " & chr(34) & Form_GR_trans.POoraclenum & chr(34)),0)

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If your PO number can contain single quotes, the first will fail..
mbizupCommented:
Also, since you are starting this with IF, i'm assuming you have a corresponding Then:

If Me.amount > NZ(DLookup("totalvalue", "po_1", "[PO_oracle]= '" & Form_GR_trans.POoraclenum & "'"),0) Then

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