Accounting Entries not balanced in AR when posting a credit bill

We have a credit invoice created in Billing and once we run the Load AR Pending item, we expected that to close the original item. Instead, it says Accounting Entries not balanced. Please suggest.

Steps: 1) Created a bill and then moved it to AR (item, which has 1 DST line as Billing Creates Accounting Entries)

  2) Created an Adjusting Bill (credit entire bill) for the above bill. In Billing module, the entries are fine but when we posted this to AR, we observed 2 DST lines in PENDING_DST in database. Is that causing this issue?