[29.x] [CH] When posting with FCY, VAT G/L Entry stores VAT base amount in Source Currency Amount instead of VAT amount

[dcenic]

When posting with FCY, VAT G/L Entry stores VAT base amount in Source Currency Amount instead of VAT amount

What & why

During initialization of a system-generated G/L Entry, not recalculating source currency amounts, as it already carries the correct source currency amount.

Linked work

Fixes AB#649597

How I validated this

• I read the full diff and it contains only changes I intended.
• I built the affected app(s) locally with no new analyzer warnings.
• I ran the change in Business Central and confirmed it behaves as expected.
• I added or updated tests for the new behavior, or explained below why none are needed.

What I tested and the outcome (required — be specific: scenarios, commands, screenshots for UI changes)

automated test

Risk & compatibility