SAP C4C - Failed to finish sales order - pricing failed

so-error.pngDear Expert,

I tried to create a new sales order, but there are some error messages appear

1. When I tried to add product on SO it said that the product that I was selected is not in the product list,
yes the product is not in the product list, but in another system i was successfully added the product without make any product list.
When do we need to create a product list first ?

2. When I tried to finish the sales order the pricing is error, it doesn't appear and not calculated as well. the system said that pricing failed, there is a problem in communication arrangement

Please refer to the attachment I attached

Please anyone help us in advance because it is important for our demo next day

Thank you

Best Regard,
Rindang