SAP ABAP Table/Structure Field ETRG - MAINDOCNO (ETRG) is used by

• Class (1)
• Function Module (8)
• Program (3)
• TYPE (1)

#	Object Type	Object Name	Object Description	Package	Structure Package	Software Component
1	TYPE	ISU17	ISU17	EE17	IS-U/CCS	IS-UT