Hi Erwin,
For Chart of Accounts, Code, Name, Active Account, Father Account Key, and Planning Level fields are mandatory.
Error displaying Illegal parameter number means, Father Account Key must have 100000000000000,
200000000000000, 300000000000000, 400000000000000, 500000000000000. Total 15 characters for Assets, Expenditure, Liability, Equity, and Revenue.
I think you are missing Planning Level and need to keep tNO for Title Account in Active Account field.
Thanks...