I am unable to import the sales order with FBDI. Log File say BILL TO CUSTOMER ID field is empty.

Summary: I am not able to import the sales order with FBDI. It does not allow the transfer, stating that the BILL TO CUSTOMER ID field is empty.

I'm filling out the FBDI with the information shown in the image.
Since there are ** symbols at the beginning of the fields, filling out just one of them should be sufficient. I'm only filling out the Party Name field and the Customer Name field. I'm also filling out the Party Site Identifier and Account Site Identifier fields. What should I enter in these fields? How should I fill them out?

What information should I take from the sales order?