I tried to look for an old SAP guide on Rhomobile | Home but even though I am sure one existed at some point, I can no longer find it.
I would recommend you explore Enterprise Browser to connect to your SAP application, RhoElements 4.0 was released quite some time ago and Enterprise Browser is the current recommended approach to connect to SAP applications on Zebra devices through an industrial browser. There is a guide here: SAP ITSmobile Usage Guide - Zebra Technologies TechDocs
Thank you so much Darryn for the suggestion. I'll check on the Enterprise Browser and let you know how it worked! Have a good one
Just to let you know that we tried the Enterprise Browser version 1.6 and it worked wonderfully for what we needed! It could be interesting to read an article on what changes have been made on this browser that makes it a better option than Rho Elements, currently.