SAP ABAP Program MPU21CB1 (callbacks -> tax reporter) is using

• Table/Structure Field (3)
• Function Module (2)
• Message Number (1)
• Table (1)

#	Object Type	Object Name	Object Description	Note
1	Table/Structure Field	T5UT6 - VARIN	Variant Name
2	Table/Structure Field	T5UT9 - VARIN	Variant Name
3	Table/Structure Field	TREEV_ITEM - NODE_KEY	Tree Control: Node Key