File Update from a form

[clauses]

I have a form used to enter service information. If the user enters a customer that does not exist on the customer file a second from opens allowing them to enter necessary customer information such as the address. After they have entered the required customer information the form is closed and control returns to the service call form so that it can be completed. When ever he service form has been completed and the service file is updated I receive and error telling me that the customer does not exist. When I physically look at the file the customer does exist so I am not sure why I am getting this error.