付款单已经生成凭证，取消付款前必须先删除付款单生成的凭证

付款单已经生成凭证，取消付款前必须先删除付款单生成的凭证

Caused by: com.kingdee.eas.fi.cas.CasException: 付款单已生成凭证，取消付款前必须先删除付款单所生成凭证！
at com.kingdee.eas.fi.cas.validate.PaymentBillCancelPayValidator.internValidate(PaymentBillCancelPayValidator.java:82)
at com.kingdee.eas.fi.cas.validate.AbstractValidator.validate(AbstractValidator.java:72)
at com.kingdee.eas.fi.cas.validate.AbstractPaymentBillValidator.validate(AbstractPaymentBillValidator.java:128)
at com.kingdee.eas.fi.cas.validate.PaymentBillCancelPayValidator.validate(PaymentBillCancelPayValidator.java:315)
at com.kingdee.eas.fi.cas.validate.AbstractValidator.validate(AbstractValidator.java:47)
at com.kingdee.eas.fi.cas.app.PaymentBillControllerBean.innerCancelPay(PaymentBillControllerBean.java:1496)
at com.kingdee.eas.fi.cas.app.PaymentBillControllerBean._cancelPay(PaymentBillControllerBean.java:1444)
at com.kingdee.eas.fi.cas.app.AbstractPaymentBillControllerBean.cancelPay(AbstractPaymentBillControllerBean.java:423)