Activity price indicator & is not supported

What causes this issue?

You entered an invalid value in the field 'Planned activity price
indicator'.
Only the following values are valid for this field:
001: automatically determined based on the planned activity
002: automatically determined based on the capacity
003: manually determined

System Response

The planning record to be included is written to the error log.

How to fix this error?

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.