You have experience working with a language that can interact with SAP, so you can start with this part and then learn ABAP as part of your work. You will, however, need to learn ABAP, as you cannot always rely on ABAPper to explain to you why / how somme data is calculated / retrieved in ERP. It is also useful to use the code for your own functions (still pay attention to the standard of ABAP-coding of the company))
I am both a technical expert in HR and a leading specialist / team leader in the SAP Portal (Java) application developer, and someone who can look at both sides of the connection (even if it is not an expert in both domains) is a very helpful person in the team developers.
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