Based on your last suggestions, I made the following changes:
On the "Other Charge Item" which had been created for the Sales Receipt, I changed the linked account to our (General Fund) "Income" account.
I changed the (Gain/Loss on Asset Sales) from being an "Income" account to being an "Other Income" account.
I changed the GJE to:
Credit $1,400.00 to the "Fixed Asset" (Church Bus)
Debit $2,000.00 to "Income" (General Fund)
Credit $600.00 to "Other Income" (Gain/Loss on Asset Sales)
I don't fully understand your last statement "You lost $1,400 of Asset, and that reduces carry over Net Fund Balance, not Income." Is there another entry that needs to be made after the above?
Here is all you should see. Start with the Disposal of the Fixed Asset:
Basis is Credited for $1,400 to Remove that from being asset value on hand; the offset is Disposal of the asset as other Income Gain/Loss on disposal of asset. Typically, there is also Depreciation to be part of this to Recapture it and the difference is the "remaining useful value we forfeited." If you never have depreciation, then you Removed $1,400 in full = total Lost Value.
In exchange, you Sold it and the sales receipt has $2,000.
And the accounting for this, reported on the P&L:
Gross Revenue $2,000
Lost from removing it from your service $1,400
= Net of $600 Gained.
You seem to have the $2,000 in Twice: once as the Sales Receipt and once as the Journal Entry.