I have performed the currency update from the desktop application.
From what I see, this added 0 to the Scale field for HUF currency. Close, reopen the currency view, and the conversion to base rate is now 0.0033 instead of 306.xx.
Now the numbers are OK.
There is a problem somewhere when updating the currencies initially. Perhaps from Android, or a different locale?

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Test 1

PC:

• create db
• create EUR account, initial balance €100
• create HUF account, initial balance 0
• sync via Dropbox

Android:

• create transfer EUR->HUF of €50.

Result: can't edit the HUF amount. The currency for EUR account is displayed as "L". (?)

https://www.dropbox.com/s/fw684qti9fuvxw9/alen.mmb?dl=0

Test 2

PC:

• create db
• sync via Dropbox

Android:

• create EUR account, initial balance €100
• create HUF account, initial balance 0
• create transfer of €50 EUR->HUF, destination amount 15000 Ft. (amount editable)
• update currencies

Result: the EUR/HUF rate is wrong.

https://www.dropbox.com/s/j0nwm15hjm14bnj/test2.mmb?dl=0

My conclusion is that the error is somewhere in Android currency update. My original issue was solved after I updated currencies in the Windows desktop version of Money Manager Ex.

What was confusing in the original case was that, in Android, the rate was displayed as 306, which looked correct as that is the rate. But in reality the currencies were swapped. The real rate was supposed to be 1/306 = 0.0033. This is the rate that was set after the desktop currency update.

I'll copy this comment into the related GitHub issue, as well.

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I checked the database I used for testing a few days ago. There, HUF has a Scale of 1 and Conversion of 306.673.

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So, the source for the currency conversion http://www.freecurrencyconverterapi.com/api/convert?q=EUR-HUF&compact=y returns {"EUR-HUF":{"val":306.6727}}

However, it should be http://www.freecurrencyconverterapi.com/api/convert?q=HUF-EUR&compact=y, {"HUF-EUR":{"val":0.0033}}.

OK, so this is the source of the problem.

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Thanks. Merged and fixed!
Pull request #24

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