How To Fix V3102 - Error: Please enter an object type and a key!

SAP Error Message - Details

• Message type: E = Error

• Message class: V3 - Maintain Sales Activities

• Message number: 102

• Message text: Error: Please enter an object type and a key!

What causes this issue?

You wanted to assign a business object to your object. To do this, you
must enter the object type and the key.

System Response

The business object is incomplete and cannot be assigned to your object
for this reason.

How to fix this error?

Enter an object type and a key.

Procedure for System Administrators

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.