Continued to check the process and the data based on the given data process and menu by sir Rey, as per checking, found out that the Purchase Order details menu is showing while the current process for the first PO executed is running, and this is because the first PO first processed does not successfully execute the step 4, 5 and 6. Checked and debugged the screen scrape for checking why it is not encountered, as per checking, the processed step 4 should be successful as the condition should be met by it is not. Checked with Ms. Katherine if they can create PO for other invoices, but as per Ms. Katherine, they can't create PO now. Continue the checking tomorrow and will request assistance from Nate to see if my checking missed something that is causing the problem.