Foreign Currency contracts

We will soon be managing about 3 foreign currency bank accounts in order to
pay some of our
overseas suppliers. We will be setting up contracts in order to secure
amounts of currency at 
set exchange rates. The amounts contracted will be based on the forecasted
values and timings
of the purchase invoices we expect to receive over the next 2/3 months. We
would like to post
and pay any invoices at the contract rate. However, if we completely spend
that contracted 
amount, any further invoices would need to be posted / paid at a 'spot' rate
(eg could be the system
rate) 

Does anyone know if there is way on System 21 of 'managing' the contracted
amounts of currency 
so that once they are used up postings can be made at the system rate?

thanks in anticipation

Tim Randall
Snr Business Analyst
Centura Foods Ltd

trandall@xxxxxxxxxxxxx
01606 830434



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