I think they refer to this post.

I think he found out exactly as you said 😁.

@Daniël Kuhlmann Sorry i did ask it there and i had to wait for weeks for an reply.. so i started a new discussion because i still have no answer to my question

I'll try to explain here again.

I'm trying to make an xml out of a record in database so i use RecordToXml, in the xml i need to add prefixes like xmlns:cac="" and xmlns:cbc="" .. 

In the example in the other post i downloaded the solution from Afonso Carvalho and i learned how to define the config for the xml but didn't find the solution to add the prefixes. But in the example i see this : <RecordList xmlns:xxx="http://namespace.com/test" xmlns:n1="http://namespace.com/test2" xmlns:n2="http://namespace.com/test3" > 

So i asked where did he put this in code?

This is an example of what the xml should look like : https://github.com/OpenPEPPOL/peppol-bis-invoice-3/blob/master/rules/examples/base-example.xml

Error @ outsystems : 'cbc' is an undeclared prefix. Line 1, position 74. 

Hoping for a solution..

Greets

I don't have a solution, if I would I would have replied.

I noticed the question wasn't linked to the component, which means those with knowledge on this topic probably didn't see it. I linked it now, so hopefully you can get an answer now.

I found the solution for the namespaces.

I added this to the top of the Invoice an i get this result

That's what we wanted.

New problem: 

we have to add prefixes to every node and child to the xml

Example: 

This point i can only add cac to the accountingsupplierParty but the child nodes lik party endpoint i can't give them cac or cbc..

This is the config i have for the prefixes (only for first line elements)

How can i configure the config that it can add cbc and cac to child nodes??