10000460 
Message
This activity is connected to a sales opportunity or service call. If deleted, it cannot be restored. Continue?
Diagnosis
In the 
Business Partner 
Activity 
path, in the Activity window, you have attempted to remove an activity for a business partner. However, the activity is linked to a sales
opportunity.
Procedure
Do one of the following:
To cancel the removal of the activity, choose No.
To unlink the activity from the sales opportunity and permanently remove the activity from SAP Business One, choose Yes.