[GNC] Selling a currency with a Split Transaction Scheme ?

[Long]

Hello,

In GnuCash documents, Chapter 12: Table 12.1. Selling a currency with a
Split Transaction Scheme.

It is possible when you manually enter the value without help from "Price
Database", Right ?
Because, if you transfer from currency "A" to currency "B" with "Price
Database", you are transferred the right value at that time and when you
transfer more value from "Income" to "B", it will not balances.

Example :
If you transfer usd to vnd when the rate are higher you bought. 
1 usd = 3 vnd
So in register, you enter transaction :
Credit usd : 1
Debit vnd : 3
=> it's balanced now.
Maybe, that guide is used for Captain Gains chapter, like selling a house or
painting. Because that asset doesn't used "Price Database".

Please help me, Thanks in advance, and sorry for my bad English. 

Regards.



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