Even though the c.type is statistical, it shoudl have come in the credit memo request you have created. If it is not coming, then you may have to check the copy controls.
In the copy control between Billing document and Sales order document, check at the item category level a field called Pricing type. It should have teh value as D. If something else is the value there, please change it to D and then try creating a Credit memo request with reference to the billing document. For better details, you can refer to the copy control between F2 and CR document for the item category TAN.
Hope this helps.
Reward if this helps.
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