3551105 - IBP: Error "No previous step was defined for step..." received when creating Process from Process Template

Creating a process instance from a Process Template gives the below error:

• Sorry, a technical error occurred. Please try again later.
  {
  "message": "HTTP request failed",
  "headers": {
  "Content-Type": "application/json;charset=utf-8",
  "Content-Length": "1062",
  "DataServiceVersion": "1.0"
  },
  "statusCode": "400",
  "statusText": "Bad Request",
  "responseText":
  "{\"error\":{\"code\":\"/IBP/PROCESS_MODEL/189\",\"message\":{\"lang\":\"en\",\"value\":\"No previous step was
  defined for step , but this is required.\"},\"innererror\":{\"application\":{\"component_id\":\"SCM-IBP-
  COL\",\"service_namespace\":\"/IBP/\",\"service_id\":\"PROCESS_MGMT_SRV\",\"service_version\":\"0001\"},\"transa
  ctionid\":\"<Log handle>\",\"timestamp\":\"<exact time stamp when the error was occurred>\",\"Error_Resolutio
  n\":{\"SAP_Transaction\":\"For backend administrators: use ADT feed reader \\\"SAP Gateway Error Log\\\" or run
  transaction /IWFND/ERROR_LOG on SAP Gateway hub system and search for entries with the timestamp above for
  more details\",\"SAP_Note\":\"See SAP Note 1797736 for error analysis
  (https://service.sap.com/sap/support/notes/1797736)\",\"Batch_SAP_Note\":\"See SAP Note 1869434 for details
  about working with $batch
  (https://service.sap.com/sap/support/notes/1869434)\"},\"errordetails\":[{\"ContentID\":\"\",\"code\":\"/IWBEP/CX_MGW
  _BUSI_EXCEPTION\",\"message\":\"No previous step was defined for step , but this is  required.\",\"propertyref\":\"\",\"severity\":\"error\",\"transition\":false,\"target\":\"\"}]}}}"
  } ...
  

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