Client &: resource & used incorrectly in PPM plan &

What causes this issue?

Client &V1&:
Resource &V2& is used in PPM &V3& as a secondary resource and/or a
non-calendar resource.

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

Resource &V2& is a resource for which the buckets are derived from
block planning.

System Response

Block planning operations cannot be created for a block planning
resource if this resource is used as a secondary resource.
Orders cannot be dispatched finitely with buckets
to a non-calendar resource.

How to fix this error?

You should use the resource in the PPM as a primary resource and set
the indicator 'Calendar Resource'.
See also SAP Note 528189.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.