Error creating forecast/planning delivery schedule

An error occurred during creation of the forecast/planning delivery
schedule.
For more precise information, refer to the next message in the error
log.

System Response

No forecast/planning delivery schedule will be created for this
scheduling agreement item.

How to fix this error?

Look into the error situation by reference to the next error message in
the results log.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.