R12.1.3 - Delete is grey out at Bank Statement and Bank Statement Lines screens

Hello,

I noticed that in the Cash Management, the "Delete" icon is grey out at Bank Statement and Bank Statement Lines screens.  What could we miss, any profile/configuration?

N> Cash Management > Bank Statements > Bank Statement and Reconciliations > Search any Payments Bank Statement and click Review> Click Lines. The "Delete" icon is grey out at Bank Statement and Bank Statement Lines screens.  (Note: The Complete check box is NOT checked).  I did some research on Oracle Support and did not find an answer.

By the way, We are using EBS R12.1.3.

Thanks.

Wonly