If everything worked well till last week then:
Check the change history of some of your materials
check the change history of your customizing
Ask your colleagues what changes have been done, what transports have been made, what OSS notes have been implemented.
Nothing new, there is a rather old OSS note explaining the design and the logic for both transactions:
23922 - MRP: Creation indicators, PReq. or planned order
And you also get to know what data you have to check for changes that happened since last week, if you not just changed the transaction to execute the planning
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