Question on cost centers

A problem I’m facing is that I can import the list of costcenters but the ledgerdetails all have blank columns in the costcenter region, making it impossible to link the transactions to costcenters.

In this case I can also state beyond a shadow of a doubt that costcenters are being used in nearly all transactions and that my user (and the super) have the proper rights.

To provide some more clarity, my issue is different from the one described in Kolom costcenter is leeg in TWINFIELD_GENERAL_LEDGER_DETAILS_V3 where the costcenter has moved to the dimension 2 column. In my data de dimension 2 fields are populated with the account/supplier of the transaction, all the other numbered fields are also empty.

Can you provide sufficient details for someone not aware of the setup and methods used to understand and reproduce the issue?