SAP Message 5A435 - Please press F11 to save your user-defined schedule again ->F1

Diagnosis
The user-defined schedule you are maintaining has so far only beensaved in one work area. The user-defined schedule will onlybecome an element of the database when the complete infotype is savedvia 'save'.
Actions of the user:
If the change to the user-defined schedule is to become part ofthe database, you should perform the "Save" function when leavingthe infotype.