For setting up an opening balance for a business partner in SAP Business One 9.0 follow these instructions:
1) From the Modules menu inside SAP navigate to Administration > System Initialization > Opening Balances > Business Partners Opening Balance
2) The Business Partners Opening Balance – Selection Criteria screen will pop up. Set the business partner range you’d like and then click OK.
3) The Business Partners Opening Balance window will open. Specific the opening balance account for offset at the top of the window.
Then enter in the opening balances on the OB (LC) column (local currency) or if the opening balance is in a foreign currency enter it into the OB (FC) column.
Click Add to create the opening balances.