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Topic: IG SelectList against each other

All greetings!
There is a table of cars,
Car | id_
And
The table of the countries:
id_ | a title | the country code
Two tables I display so, through IG:
Car | a country title | the country code
Columns a title and the code made through SelectList.
The task, at title change the code changed, and at code change the country title changed.
Tried to make through the speaker an action against each other. Cycling logically turned out.
Who faced the similar task, prompt where to "dig"?
Thanks!

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Re: IG SelectList against each other

In DA there is a tick, to suppress event change. To you approaches, cycling will not be.