How to prevent cost processor error

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How to prevent cost processor error

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Hi

What are the transactions that causing error on cost processor? This is my cost profile, and we use centralized cost organization. We also use process manufacturing. We actually running cost processor at the end of month, not daily.

We face similar error for each month:

The transaction wasn't processed because the cost processor can't determine the output costs.
The work order close transaction could not be processed because there are unprocessed transactions on this work order.
The outgoing inventory transaction couldn't be costed because there's no layer cost for the item.