Why is the automatic suggestion of an Account not executed In Bydesign?

About SAP Business Bydesign

When creating an Invoice without PurchaseOrder,
and erstwhile utilizing Items without an Item Master,
Why is the automatic proposition of an Account not executed?

I person done the pursuing settings.↓
Please fto maine cognize however I should resoluteness this!

1, Link Chart of accounts to Company Code.
2，Create Account Determination Group
3，Connect Account Determination Group to Company Code
4，Connect Supplier to Chart of accounts