How to analyze exception 20

Hello experts,
I have a doubt about which is the best way to control exception 20 in SAP.
This is the scenario. In the BOM, we add a new item that has procurement type = F. Once the BOM has been updated, we launch the MRP and purchase requisition is generated. We make some changes to this purchase requisition. This means that the fixed indicator is set. If we launch the MRP again, this purchase requisition remains the same.
For example one month later, this new item is changed in the BOM for other item. If we launch the MRP, a new purchase requisition is generated for the new item and exception 20 is set for the first item.
My question is which is the best way to control this kind of situations? I mean that there is no automatic way to identify this “errors”. The only way is look for them manually in MD06?? Is there any other way to control them?
Thanks in advance
Laura

Hi Laura
Exception message 20 is triggered because the fixed purchase requisition is not within the rescheduling horizon.
The following WIKI explains why this exception is triggered during the rescheduling check (see example 4) and the relevant customizing settings:
What is rescheduling and how does it work - ERP Manufacturing (PP) - SCN Wiki
You can enlarge your rescheduling horizon to minimize the occurence of this exeption on your system, however, the best way to catch it is using MD06. You can run the transaction using the exeption groups as a selection criteria, to see only materials with this kind of exception message.
BR
Caetano

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