Copy table from parent to child issue on transition with Scriptrunner

def sourceIssueKey = "IN-2" // in Post-Function use 'issue.key'
def targetIssueKey = "IN-7" // You know where to put it ;)
def tableFieldId = "309" // recive id from App/Field config

final externalUrl = "https://apps.stagil.com/stjc/rest/stj/1.0/api/table"

def issueObj = get("/rest/api/3/issue/{issueKey}")
        .routeParam("issueKey", sourceIssueKey)
        .asObject(Map).body

def sourceTable = get("${externalUrl}/customField/{field}/issue/{issueKey}")
        .routeParam("issueKey", sourceIssueKey)
        .routeParam("field", tableFieldId)
        .basicAuth(STAGIL_TABLELS_API_USERNAME, STAGIL_TABLELS_API_TOKEN)
        .header("accept", "application/json")
        .asObject(Map).body


sourceTable.get("data").each{ def row ->
    logger.warn "${row.id}"
    logger.warn "${row.getClass()}"
    def ignoreredKeys = []
    row.each{
        if (!(it.getKey() ==~ "field-\\d*")){
            ignoreredKeys.add(it.getKey())
        }
    }
    ignoreredKeys.each{
        row.remove(it)
    }
    def json = JsonOutput.toJson(row)
    logger.warn "$json"

    def targetRow = post("${externalUrl}/customField/{field}/issue/{issueKey}")
            .routeParam("issueKey", targetIssueKey)
            .routeParam("field", tableFieldId)
            .basicAuth(STAGIL_TABLELS_API_USERNAME, STAGIL_TABLELS_API_TOKEN) // define your credentials in Scriptrunner Variables 
            .header("Content-Type", "application/json")
            .header("accept", "application/json")
            .body(json)
            .asJson()
}

return sourceTable