采购付款结算，勾选红蓝付款单，点击手工结算报错

问题描述：

采购付款结算时，过滤界面勾选【按应付日期查询】，打开结算界面后，赊购方式正负记录优先对冲为勾选状态，选择一正一负付款单，点手工结算报错：

Caused by: java.util.NoSuchElementException at java.util.ArrayList$Itr.next(ArrayList.java:854)

at com.kingdee.eas.scm.framework.writeoff.app.WriteOffCommonFacadeControllerBean.getWriteOffMapping(WriteOffCommonFacadeControllerBean.java:219)

 at com.kingdee.eas.scm.framework.writeoff.app.WriteOffCommonFacadeControllerBean.doWriteOff(WriteOffCommonFacadeControllerBean.java:1433)

 at com.kingdee.eas.scm.framework.writeoff.app.WriteOffCommonFacadeControllerBean._manualWriteOff(W