Changes in Material Master leading to issues in MRP

Hi,
For a particular material a user changed a lot of material master data (MRP1 and MRP2 view) within a couple of hours.
As a result MRP is not working as we would expect:
- some orders have no quantity in the "Available quantity" column in MD04 and as a result do not trigger any PO (Received/Required quantity = -1, but Av qty = blank)
- whenever a shipment is foreseen it is consumed/reserved by/for the order which requested delivery date is closest after that shipment date
These are the changes made to the master data in November 2009:
Planning Strategy Group: from Make-To-Stock Production to No Planning to Strategy Group for Spares & Consumables to No Planning to Strategy Group for Spares & Consumables
MRP Group: from Client Specific MRP Group for Period Mgmt to General to External Procurement to Client Specific MRP Group for Period Mgmt to General to Client Specific MRP Group for Period Mgmt
Availabilty Check: from Indiv. Req. to Indiv. Req w/o PO. to Indiv. Req.
Unplanned Consumption in period: from blank to 11.2009
Fwd Consumption Period: from 0 to 999 to 0
Consumption Mode: from blank to Forward Consumption Only to blank
Unchanged MRP material master data:
Bwd Consumption Period: 0
MRP type: MRP
Planning Time Fence: 1
Lot size: WB (weekly lot size)
Procurement type: External Procurement
Backflush: always backflush
What should we do to have MRP work correctly again for this material?
Changes to material master MRP? Delete all schedule lines and start from scratch in SOs?
All help is much appreciated!
Best regards,
Geert
Edited by: Geert P on Dec 10, 2009 6:08 PM
Edited by: Geert P on Dec 14, 2009 4:04 PM

Solved internally by adjusting Strategy Group

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