Hi Parda
To run a background job for PRAA we need to create a variant & run a program "RPRAPA00"
Step: 1
Job Name: A/P_ACCOUNTS
Program Name: RPRAPA00
Variant: NEW_VENDOR_CREATE
when system runs this program it reads a following work file location
"/usr/sap/RD1/SYS/global/APACT" which is a std in system. this workfile location will be using a program "RSBDCSUB" where we are triggering with a background job & variant
Step: 2
Job Name: A/P_ACCOUNTS
Program name: RSBDCSUB
Variant: VENDOR_EMP
Program Name: RFBIKR00
Now the session for the Job will automatically perform this program "RSBDCSUB"
Step: 3
Job Name: A/P_ACCOUNTS
Program Name: RSBDCSUB
Variant: A/P_EVENDORS
this is a Batch Input process program.
Please see the config, provided in this link & work accordingly to it,
http://scn.sap.com/docs/DOC-27098
Kindly follow the same sequence. Hope this Info will be useful
Cheers
Pradyp