[GNC] Scheduled Transaction with Currency Conversion

[rsbrux]

We have monthly transactions where a payment in USD is credited to a CHF 
bank account. The USD amount is fixed, but the CHF amount varies 
depending on the conversion rate. As has been recommended on this list, 
I have configured these as scheduled transactions with a variable in 
place of the CHF amount .  However, when the scheduled transaction 
triggers in GnuCash, I am asked to fill in both the CHF amount *and* the 
USD -> CHF conversion rate. Unfortunately the bank notification does not 
include the conversion rate.  In fact the bank doesn't even know the 
conversion rate, because this is determined by the payor, which performs 
the conversion before the bank deposit. We don't receive any 
notification from the payor (U.S. Social Security). IMHO, it should be 
enough to supply *either* the credited amount in CHF *or* the USD -> CHF 
conversion rate, since GnuCash can calculate one from the other, but GC 
won't allow me to click "OK" without supplying the USD -> CHF conversion 
rate explicitly. The scheduled transaction template has no place to 
enter the conversion rate, otherwise I would put in a formula based on 
the variable CHF amount. How can I get the scheduled transactions to 
complete, without knowing the conversion rate?