No account assignment data exists for the selected item

&USE&
This function is only defined for postings with reference to purchase
orders with account assignment.
For direct posting to G/L accounts, the system records the additional
account assignment data on the G/L account items screen.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.