You are the producer of a component with an OPC UA interface. You want to certify it to IEC 62443-4-2 using ISASecure CSA or ICSA schemes.
Before you can do that, you must certify its development process to IEC 62443-4-1 using ISASecure SDLA. To achieve the SDLA certificate, you must demonstrate that you follow the 8 security practices defined in the IEC 62443-4-1 standard.