Hi Agneum,
To configure this go to the following menu General Ledger --> Chart of Accounts --> Dimensions --> Financial dimension configuration for integrating applications. In here you can configure 4 options:
* Default dimensions format, dimension layout used for default dimensions (like you set up on customers / vendors / items / etc)
* Ledger dimension format, dimension lay out used for general ledger postings
* Budget register dimension format, dimension lay out used for budget register entries
* Budget planning dimension format, dimension lay out used for budget planning
As you can have different set up of dimension formats in your account structure, you need to tell D365 how to handle this while exporting / importing. Since you can only define one setup per options, in general you would create one big string in an order of your choosing containing all the relevant dimensions for your company, however you are completely free in doing this. This will give you the flexibility of hiding dimensions in exports as well (like the personnell number for example).
Please see the screenshots below for extra reference.


