i received the below error in purchase order

please advise how to solve it.
i received the below error in purchase order

please advise how to solve it.
Best answer by Ieva Rituma
You need to add the numbering series there.
When the FA is set up to automatically create the asset from the PO receipt, the series has to be there so that IFS has something to put in the ID. The asset ID is a concatenation of the series ID and the number defined. (In your example it will be CASxxxxx).
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