FYI. i had faced this issue in ID(swing tool). After sld cache refresh system is allowing to edit the objects.
but question is why same is not working in nwds.
i have around 30 interfaces with business system.
business sytems : SIDXXX
Since i am not able to edit/delete the iflow, i am forced to go for ICO with change in business system. " SID_XXX".
we did not have enough time to go to SAP and get it resolved as prod system was migrated without doing any dev testing by basis.
now i want to wipe out the old system iflow objects in new system.
Whatever magic iflow is doing, still i hate it. every time you have to deploy, sometimes deployment fails in first attempt and second attempt it is succeeding.