Product &1 not found in database

What causes this issue?

The product &V1& used in the following object (see information message)
exists neither in the current integration model nor in the database.

System Response

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

How to fix this error?

Please transfer the products needed by the PPM either before or with
the current integration model. Should the current integration model
contain the product, please check the application log for possible
error messages.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.