ME52n - always last banf is selected / parameter with banf number does not work

Hi All,

I am currently implementing a webdynpro application - this application calls the transaction ME52n to change a purchase requisition.

But always when I call this transaction the last purchase requisition is automatically selected. How can I change this that the transaction gets my parameter as correct number or can I change internal the last used purchase requisition number?

Thanks for your help!

Christoph