Displaying only simulated documents in EA05

Hi All,

I have a requirement mentioned below:

1. One set of user can release simulated as well as actual billing documents.

2. Another set of users can release only simulated documents.

I checked authorization objects also, but of no use.

While exploring I found a user exit "EBIA0013" : IS-U: Customer Checks in Billing Selection, where structure EBISID is available with some parameters.

Q1. Is there any other methodology to do the same?