New answers tagged iframe
The Office Dev Patterns and Practices repo on GitHub has a great sample for provisioning custom web parts on the host web from inside of an app which should be a viable option for your situation. You could use this pattern to allow users to retrieve a custom configured web part and have it inserted into their host web allowing them to insert it at will (you ...
Edit the page and insert a Page Viewer Webpart. Now edit the webpart properties and set Link property to the target SAP page. Save and refresh the page. Note - If you still have issues, then it is not related to SharePoint
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