External company config issue

We setup Multi Company Direct within External Company Config.
Goal is to have AR invoices created by A to automatically be entered as AP invoice in company B.
Unfortunately this does not work because of the error “tax code is invalid”.
Is it possible to have the process work without Tax codes matching in both companies?
We simply have to use different codes (different countries).

Only the codes need to match - you need to have the same tax liability and tax type code in both companies. But that doesn’t mean the rates need to be the same: tax type X in company A can have a rate, but tax type X in company B can have a different rate.

What we did is we added a separate tax with the same code in both companies and set that for customer in company A and supplier in B. Your Accounts will probably want IC to go to different GLs than your usual sales/purchases anyway.

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Isn’t it possible to have the process work without the need to have matching tax type and liability?

I tried something similar a good few years back but I didn’t manage to get it working. Maybe it works now in the new versions.
There’s something called Translations in External Company Maintenance. I think you can config that to do what you want. Again, not sure how, we ended up adding the same rate code in both companies.