In Item Master Data > Planning Data tab you can define Tolerance days. 
  
  
Related to order scheduling: If there is negative stock in the time line, the item will be shown in MRP as shortage. Here you can enter the number of days. A negative balance will be tolerated.  
  
Example: 
Stock = 0 
Sales order = 3rd May 
Purchase order delivery date = 6th May 
Material comes 3 days late 
  
  
If tolerance date for this item is defined with 3 days or more, the result is: OK 
If tolerance date is < 2, the MRP must inform you. 
  
In MRP the filter "Only shortage" means:  
Display all entries which have a negative balance in the timeline. 
  
(MRP Filter - Predefined Filter) 
  
In this example the item has a balance from 0, but a negative balance between 3 and 6 May 
MRP displays this item if the item has "tolerance days" < 3 days. 
MRP does not display this item if the item has a "tolerance days" > 3 days. 
  
Negative Balance in past 
Negative Balance in past will be ignored entirely. 
The calculation for the time area starts from the current Date. 
  
Example: 
Today is 5th May 
Sales Order is 3rd May 
Delivery = 6th May 
  
The system calculates: Balance is negative from 5th – 6th May = 1 day. 
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