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
mmouslyAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Rey Obrero (Capricorn1)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
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Access

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.