Message type: E = Error
Message class: PV - Training and Event Management
Message number: 407
Message text: Resource is already locked
The resource is already locked in the selection period.
Choose a valid lock period.
Error message extract from SAP system. Copyright SAP SE.
PV406 Day & has already been entered
Self-Explanatory Message Since SAP believes that this specific error message is ...
PV405 Select either 'active' or 'planned' status
Self-Explanatory Message Since SAP believes that this specific error message is ...
PV408 Resource is reserved
What causes this issue? The resource is reserved by another object in the selec...
PV409 Error when creating lock relationship
What causes this issue? Error when creating the lock relationship. Infotype 100...
SAP messages fall into 3 different categories: Error messages
(message type = E), Warnings (W) or Informational (I) messages.
An error message will prevent you from continuing your work - it is a hard stop and you need to fix the error before you can proceed. A warning message will stop your work, however, you can then bypass the warning by pressing the Enter key on your keyboard. That said, it is still good practice to investigate the cause of the warning message and address it. An information message will not stop your work and is truly just for informational purposes.
Click on this link to search all SAP messages.