通过MRP例外信息，可以使计划调整计划参数设置，计划环境，产能负荷方面信息，同时使MRP运行出来的数据更合理和更准确。
1.Items allocated across projects: items whose supply for one project has been allocated to the demand of a different project
2.Items below safety stock: items for which demand, less supply, brings the projected quantity on hand to a negative level or below safety stock
3.Items that are over–committed: items for which ATP is negative or below safety stock
4.Items with a shortage（短缺物料）: items whose quantity on hand is less than the sum of the requirements plus safety stock, within the exception time fence defined by the item’s planning exception set（在手量少于（总需求量+安全库存量）被视为短缺物料，在例外集定义）
5.Items with a shortage in a project（一个项目中无论短缺物料）: items whose demand exceeds supply with a project/task for an item（在一个项目中，需求大于供给的短缺物料）
6.Items with excess inventory（超出库存料件）: items whose quantity on hand exceeds the total requirements against the item, within the exception time fence defined by the item’s planning exception set（当前库存超出总需求数量，在例外集设定值之上的料件）
7.Items with excess inventory in a project（在一个项目中超出库存料件）: items whose supply exceeds demand with a project/task for an item（在一个项目中，一个料件供给超出需求）
8.Items with expired lot（过期料件）: lots that expire within the planning horizon（在水平展望期内批量过期）
9.Items with negative starting on hand（在手量开始为负库存料件）: items with a negative onhand beginning balance（在手量开始为负库存料件）
10.Items with no activity（不具有活动的物料）: items with no demand or supply in the current plan（在当前MRP中没有参与运算的料件）
11.Items with repetitive variance: items with suggested aggregate schedules that differ from current aggregate schedules by more than a user–defined repetitive variance percentage, up to the exception date defined by the item’s planning exception set
12.Late order due to resource shortage（由于瓶颈资源导致order推后）: items that will cause a late order because a resource required to manufacture the item is overloaded
13.Late supply pegged to forecast（最迟供给反查预测）: items with shortages that prevent forecast demand from being met, caused by component shortages （短缺物料导致预测延迟满足）
14.Late supply pegged to sales order（最迟供给反查订单）: items with shortages that prevent sales order demand from being met, caused by component shortages(短缺物料导致订单延迟满足)
15.Orders to be cancelled（要取消的订单）: items with orders that the planning process recommends be cancelled （MRP建议取消工单，采购单）
16.Orders to be rescheduled in（重新计划提前的单）: items with orders that the planning process recommends be rescheduled to an earlier date（MRP建议提前工单，采购单）
17.Orders to be rescheduled out（重新计划延期的单）: items with orders that the planning process recommends be rescheduled to a later date（MRP建议推后工单，采购单）
18.Orders with compression days（具有压缩天数的订单）: items with planned orders, discrete jobs and purchase orders that have compression days and need to be expedited（对计划订单，工单，采购订单需要压缩时间来加速完成）
19.Past due forecast（过期预测）: items with a forecast demand due date earlier than the plan start date（料件预测日期早于计划起始日期）
20.Past due orders（过期订单）: items with planned orders, discrete jobs and purchase orders that are past due（指过期的计划订单，工单，采购单）
21.Past due sales orders（过期销售订单）: items with a sales order due date earlier than the plan start date（销售订单日期早于计划起始日期）
22.Resource Overloaded（资源超载）: a resource is overloaded, as defined by the load ratio entered in the exception set（资源超载是定义在例外集里面）
23.Resource Underloaded（资源欠载）: a resource is underloaded resources, as defined in load ratio entered in the exception set（资源欠载是定义在例外集里面）
常用例外信息及解释如下：
组 例外信息 解释
02 订单创建日期在过去，可能是没有及时处理
03 订单开始日期在过去，可能是没有及时处理
04 订单结束日期在过去，可能是没有及时处理
64 无法满足订单交货期，系统根据工艺路线排产后，发现实际完成日期在交货期之后。
01 例行提示，告诉你此订单已由系统自动改变，适用于没有作过任何处理的订单
42 订单的建议已经被改变，用于数量的变化
62 工艺路线错误或没有工艺路线
52 无BOM
96 现有库存低于安全库存
10 建议将交货期提前，会给出再计划日期
15 建议将交货期延后，会给出再计划日期
20 建议取消此订单，一般情况下用于上层的需求已取消，或此订单是手工建立的
30 系统根据上层需求的变化对订单的交货期提出建议，一般会给出一个再计划日期
98 计划不正常结束