(1) TAXCA - Per SAP library, it can be used within SAP WITH-OUT jurisdiction code
(2) TAXCAJ - Per SAP library, it can be used within SAP WITH jurisdiction code
(3) TAXCAX - Per SAP library, it can be used at OUTSIDE SAP (along with Vertex tax engine) with jurisdiction code
Unfortunately my client system has only two tax procedure (1) TAXCA and (2) TAXCAJ for Canada. So my question are that (1) can we use the procedure TAXCAJ for External tax calculation at tax engine Vertex. If yes what are all the changes OSS note required, and (2) If i should not use TAXCAJ, then how to bring TAXCAX in to system. Whether i need to upload any OSS note etc.
Kindly help me by providing answer.