Diagnosis
In Customizing the assignment between assets and Real Estate objects isset at 1:1.
The asset you have selected is already assigned to building '&V1&' andtherefore cannot be assigned to another Real Estate object.

System Response
The system does not accept the assignment of the asset.

Procedure
Assign an asset that has not already been referred by a Real Estateobject.
If you have to assign more than one Real Estate object to an asset,contact your system administrator.

Procedure for the system administrator
Check and correct the settings for asset assignment in Customizing asrequired.