SAP ABAP Class CL_COM_HIERARCHY_TREE (Category Tree of a Hierarchy) is using

• Class (68)
• Data Element (31)
• Table/Structure Field (91)
• Function Module (5)
• Message Class (1)
• Message Number (1)
• Class Method (72)
• Program (6)
• Table (27)

#	Object Type	Object Name	Object Description	Note
1	Message Number	COM_CATEGORY - 801	Parameters required to call function module &1 are missing