付款申请单共享服务工作流配置后，未能进入共享任务池

版本：EAS8.1
问题描述：配置的付款申请单流程，流程能够到达审批节点，但是任务没有进入共享任务池。节点阻塞。
脚本如下：
imageNo = com.kingdee.eas.base.wssc.BillImageFacadeFactory.getLocalInstance(__bosContext).getImageNumber(null, PayRequestBill.id);
shareCenter = new java.util.HashMap () ;
shareCenter.put("jobPriority" , "2");
shareCenter.put("billId" , PayRequestBill.id);
shareCenter.put("procInstId" , processInstID) ;
shareCenter.put("assignId" , "");
shareCenter.put("photoCopyerID" , "");
shareCenter.put("barCodeID" , imageNo);
shareCenter.put("isPhotoCopy" , true);
shareCenter.put("isNode" , true);
shareCenter.put("billofDocumentID" , PayRequestBill.id);
shareCenter.put("Solution" , "eas");
shareCenter.put("dataCenter" , "cs1");
shareCenter.put("isTaskCenter" , true);
shareCenter.put("subject" , "请审核编码为" + PayRequestBill.number + "的付款申请单。");
shareCenter.put("systemAttribute" ,"arap");
shareCenter.put("billType", "AP_PayRequestBill");
shareCenter.put("jobCreateID" , PayRequestBill.creator.id);
shareCenter.put("businessAttribute" , "AP_PayRequestBill");
shareCenter.put("orgNumber" , PayRequestBill.company.number);
flowOperation = "ssc" ;

图如下：