Sorry for confusion. Our WD4A application has an action link, that runs the transaction in a new window using the WebGui (as a link to /sap/bc....webgui).
An example of the link generated is:
https://domain:port/sap/bc/gui/sap/its/webgui?~webgui_icon_toolbar=1&~webgui_simple_toolbar=2048&~singletransaction=1&~transaction=*PA30 RP50G-PERNR=00000001;RP50G-CHOIC=8;RP50G-SUBTY=0;DYNP_OKCODE=LIS1
This opens PA30 in HR, fills the personel number and opens infotype 8 with the list of records. This works fine.
Here, webgui_simple_toolbar has the value of 2048, however we tried all possible combinations. E.g. This way - the command field (for the transaction number) is shown, even though it should be hidden. Shall there be any action in the GUI the user makes, the field hides then (so later on, it acts as expected).