Initial SERC Load with OCC

Dear Experts,

I hope that everyone is fine and healthy. I am stuck with SAP EH&S problem and as SAP EHS consultant, I was hoping that we can share knowledge. . I was hoping that one of you guys can help me. I want to upload substance with open content connector for SERC database with XML file but I am not able to get the initial load from XML file in to SAP. I have already created RFC and I can call OCC from CG02 via data determination but I cannot upload substances from XML file via OCC to SAP. Has anyone got experience with initial SERC database via OCC ?

Can you give me some advice?

Thank you in advanced for your help.

With kind regards,

Maywand