Assume that you have to plan the invoice creation (Milestones and
Customer advance) before the project is created. But now, it's impossible to
set the project in the process stage until you get the approval from the
customer to start (this can be months later). The customer is creating the
customer advance (prepayment) which will be paid at the moment of signing the
contract from the contract instead of from the project. When this happens, the
prepayment isn't suggested later for reconciliation in the invoice proposal.
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