"Account code is mandatory"
This error originates from Twinfield and can be for several reasons.
Would you like to check the following in Twinfield:
Step 1: Is the VAT code linked to an account code?
Check this via Settings -> Company setup -> VAT -> I 21% select and edit-> allocation rules -> account code filled in?
Step 2: Is the creditor/supplier linked to the supplier's system account?
Check this via Financial Professionals -> Dimensions -> Crediteuren -> (supplier at hand) -> tab 'other' -> general ledger account filled?
Step 3: Is the supplier's system account filled?
Check this via Settings -> Company Settings -> Company Settings -> system accounts -> accounts payable filled?
Also check whether the set ledger accounts are set to Active.
Check this via Reports > Reports > 'General ledger' view category > press arrow left from 'Line 1-10 of 20' > General ledger overview
If it still doesn't work after following these steps, please let us know which administration it concerns? Then we will perform a full synchronization.