You have migrated Materials using the Migration tool and you have assigned wrong Distribution Channel to Materials. Your requirment is to change those wrong Distribution Channel
Reproducing the Issue
1. Go to Business Configuration work center
2. Select Implementation Projects view or Overview.
3. Search and Open the migration activity Migration of Materials
4. Execute Migration for the respective Migration File
This is standard system bahviour.
It is not possible to remove the Sales Data once it is active through Migration or Manually. You have to mark the Materials as Blocked
KBA , LOD-CRM-PRO , Products , How To