SAP Message V1239 - Condition & cannot be entered manually

Diagnosis
You have attempted to enter a condition manually. For this conditiontype a valid condition record exists. Thecondition type is set in such a way, that manual entries are onlypossible, if no condition record exists. This is controlled inCustomizing in the field 'Manual entries' on thecondition type screen.

System Response
The system does not allowe the entry of the condition.

Procedure
Delete your entry. If required, you can change the control of thiscondition type in Customizing, if you have the authorization. Ifnecessary, contact your system administrator.
IF &DEVICE&='SCREEN'
Proceed
ENDIF