Validation in access and in queries

i need to make  a validation during enter data in table or form , the validation is that the amount in field is not exceeding the corosponding value in queries , and hoe to define the relation that lead to this corrsopnding data , ie table contain po and in the form i need to enter the recieving related to the po but not to exceed the original po amount
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Rey Obrero (Capricorn1)Connect With a Mentor Commented:
<i need to make  a validation during enter data in table or form>

do the validation using a form..

use the beforeupdate of the form or the control (textbox) where you enter the data.

private sub controlName_beforeupdate(cancel as integer)
' verify the amount

if me.controlName > dlookup("originalamount", "tableName", "[po]=" & me.txtPo) then
   msgbox "Amount is greater than original amount"
   cancel=true
  exit sub
end if


end sub
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