Checked issue raised by RMSI-IT regarding manual creation of PO. Fuction F7 upon entering the SKU and quantity in PO directs to the PO Master option instead of the PO confrimation screen.
Steps:
a. Simulate the process in production environment, same issue was encountered.
b. Simulate the process in test environment and all functions are working well
c. Cascade issue to ERP team for debugging. 
d. Discuss with Bel the process on how to create PO
e. Issue was resolved and cascaded to stakeholders for checking