Multiple update statement not updating the table

Hi All,

I'm updating EKPO table using 2 update statements as follows.

1. If first update statement is successful ,COMMIT and WAIT.

then,

2.perform the next update.

This works when I'm creating the PO in but when im doing it using 4(send immediately) then I get a

dump " COMMIT IN POSTING'.

Please help.

Thanks,

Faiz