Hello, Krishna and thank you for your reply!
I've checked the access sequences and there seems to be only one assigned to 0NA0 and it is SAP010. However, when I try to add the one you told me, it is not in the list, I have other tables that the ERP use such as CUS910, CUS911, should I add them?
Other than that should I assign the free goods determination procedure 0NA0 via the path CRM->Basic Functions->Set Up Free Goods-> Assign Free Goods Determination Procedure?
And could you please tell me how to check the condition record for calculation rule and type? Is it via Master Data -> Prices and Conditions -> Maintain conditions?
Thank you for your help.