Dear Ranganath,
Balance is 950, not 50. Anyway, we can do like this :
T-Code MASS, enter BUS2012 Purchase Orders
Execute it. Select the PO items, select all PO nos. Top left corners MASS MAINTAINENCE , enter new Field values. Click the delivery complete indicators & send to lleft side n then enter. Now pop up will come, click the new value tick that box and then click the transfer n execute it.
then save it.
Rgds,
Rupesh