Receipts transaction question

We have recently established a customer account in USD.

When we post a receipt we see the following example in the Receipts Transaction Report:

1065          Bank                                            2587.32

4740          Misc. Revenue                               69.67

5800          Bank Charges                                10.28

1200         Accounts Receivable                                                                       2667.27                 

We have posted 4 payments now and each time account 4740 is involved, my question is, is 4740 a linked account that was linked at the time the new customer USD account was established and is this normal? If not normal where do I go to unlink/unassociate account 4740 from the receipt accounting.

Regards, Warren