Hi Vivek,
Please check these Business Functions are activated (assuming you have Ehp6 or 7 on your system):
FIN_TRM_LR_FI_AN , FIN_TRM_LR_FI_AN_2,FIN_TRM_LR_FI_AN_3,FIN_TRM_COMM_RM and FIN_TRM_COMM_RM_2.
In case these are activated, i suggest you do an remote adjustment from 000 client. Sometimes the BC sets in the business functions don't get activated properly.
You can also create these Transaction types manually.
By default there will be only one Transaction category - 300 for the product category 810 (Commodity Swap). You would have to create other transaction types - 301,302 and 303 by keeping the transaction category as 300 (810-300) and then adjust the field settings based on what type of transaction it is.
Also Check table AT01, if the transaction category 300 is assigned to product category 810.
As for your other questions, you can copy the the update types assignments similar to an IRS product and the accounting really should be as per the client requirements.
Regards,
Nikhil