enter data in access

[The bard]

I have created an invoice form in Access2007. All the items are sub totalled,
carriage added, vat calculated and then grand totalled. How do I manually
enter the carriage charge in to the form so that it is 'picked up' by the
calculation (vat = (subtotal + carriage)*.175). At present I can enter
carriage, but it is not recognised in the calculation.

 

[KARL DEWEY]

At present I can enter carriage, but it is not recognised in the calculation.
Is the textbox the Carriage is entered bound to a field?

What type of object is your formula (vat = (subtotal + carriage)*.175)
entered?

You did not mention anything about your table structure that contains the
data. What does it look like - table & field names and the datatype.

 

[The bard]

The textbox is not bound. All other items are set up in a table and work ok.
I cannot set 'Carriage' up in table as this is not known until goods are
shipped, so needs to be entered manually.

 

[KARL DEWEY]

Seems to me you would want to record Carriage in your database otherwise how
do you look it up - search a paper file?
I asked two more questions that you did not answer. Need input.