See test test_split_by_everything which currently doesn't actually do that - but it shouldn't till this Q is resolved.

Both the country and region percentages should sum together to make 100%.

https://iatistandard.org/en/iati-standard/203/activity-standard/iati-activities/iati-activity/recipient-country/#example-usage

When both the recipient-region and recipient-country are declared, then the @percentage values should sum to 100% per region vocabulary for the specific iati-activity.

<recipient-country code="AF" percentage="50" />
<recipient-region code="489" vocabulary="1" percentage="50" />
<recipient-region code="A1" vocabulary="99" percentage="50" vocabulary-uri="http://example.com/vocab.html" />

Ah, I had heard that but didn't understand the significance.

So, when an activity has both 2 countries AND 2 regions with %'s defined you should get:

• Country A
• Country B
• Region A
• Region B

And the sum value of those 4 transactions should be the same as the value on the original transaction?

That's right. But it gets more complicated when there's regions from multiple vocabularies.

Ok, how should it work in that case?

Activity has 2 countries (A and B) and 2 regions in one vocab (C and D) and 2 regions in another (E and F), the split on each is 25%.

Should you get?

• Country A, 25%
• Country B, 25%
• Region C, 25%
• Region D, 25%
• Region E, 25%
• Region F, 25%

So now adding up all the values of all these transactions gets you more than the original value! But if you add up per vocab (and including anything not marked for a region vocab) you get:

• A + B + C + D = 100%
• A + B + E + F = 100%

[ Except the adding up gets more complicated as sectors can also have multiple vocabs ]

Yes, that's right.