Message Number list used by SAP ABAP Class CL_CGPL_STRUCTURE_TREE (Project Planning - UI Structure Tree)
SAP ABAP Class CL_CGPL_STRUCTURE_TREE (Project Planning - UI Structure Tree) is using
# Object Type Object Name Object Description Note
     
1 Message Number  CGPL_OBJECT_SERVICES - 400 You cannot use the selected object as the target for 'paste'