Destination for data mart unknown

&cause&
The demand planning cannot access the planning datamart.

How to fix this error?

Please maintain table /sapapo/t445dest for application DMDPLAN.
You then have to setup the proper remote function call using
transaction sm59.

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.