How to Find IDOC number through Invoices/Deliveries

If we have mass number of invoices/deliveries then we can’t find IDOC number by going to invoices/deliveries one by one. So I did some research and found two most important tables IDOCREL andSRRELROLES which reduced lot of efforts of mine. We have to follow certain steps, which are explained below –

1. Go to SE16n and enter the table name SRRELROLES
2. In the key field we have to pass invoices/deliveries

3. After that we have to select all values of GUID of a role from table SRRELROLES and enter the  IDOCREL’s field ROLE_A

Then we have to select all values of ROLE_B from table IDOCREL and enter the values in table SRRELROLES’s field ROLEID

4. Finally you will get IDOC's number.