fix: Debit and Credit mismatch on transaction currency debit and credit values

[ruthra-kumar]

Issue

Debit and Credit values in Transaction currency have a slight mismatch on high precision exchange rates. This is un-fixable on the current approach.

Solution

Instead of calculating Transaction Debit and Credit from base currency, use values directly from parent document.

todo:

• purchase invoice
• sales invoice
• journal entry
• payment entry