I'm having trouble implementing this in an invoice.
Basically, I am trying to select a:
1. Company
2. Contractor
3. Service
And have the rate automatically updated in the invoice_details subform.
The Company and Contractor are located in the invoice form.
The Service, Quantity, and Rate are...
Here's the situation.
Each contractor has different rates for each company, and usually they stay the same, but they occasionally change over time, so it'd be nice if i could change that later without affecting previously issued invoices.
How can I create a database design that when creating a...
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