Hi Zunaid,
Zero balance Clearing account/Self balancing account is a technical account needed by SAP to balance the books at the level of Profit center/business area (as per your configuration)
This is triggered by the system and has no impact on your P/L account, but is required by the system in case you want to have a balanced financial statements at one level below the company code.
For example:-
Dr... PC1 and CR. PC2, if this is posted in the entry view, then in order to balance the DR. and CR. at the PC level, system will trigger Zero balance Clearing account.
and the entry would be
DR. .... GL Account PC1...100
Dr. ......ZBC Account PC2...100
CR. .....GL Account PC2..100
CR.......ZBC Account..PC1..100
Hope this clarifies.
Regards,
Kavita