How to identify the different transaction categories in SLA for Cost Management?

Question:

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How to identify the different transaction categories in SLA for Cost Management?

Issue:

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Please note that I am not referring to MTL SLA mapping with respect to the Accounting Line Type.

We have lot of docs available for the Accounting line type marring with transaction type.

I am referring to the different types of transactions like PO, INV, WIP, SO etc..

I believe for PO, we have transaction category = PO_DELIVER, for SO we have the transaction category as SO

and for INV, we have the transaction category = INV.

Need to know where we can find this information for other types. This would be useful to help us develop custom sources