ISZ0285E Unable to allocate ACB for session IMS because ISM user has multiple ACBs to same app

Question

Is it valid for one IBM Session Manager for z/OS (ISM) user to have multiple ACBs to the same application? This seems to leading to quite a few ISZ0285E messages:

ISZ0285E [userid termtype termid] Unable to allocate ACB for session IMS(session_number)

I went into Session Manager and entered QUERY APPLID IMS and found about 64 users active.

My RANGE statement is as follows:

 RANGE IMS
 FROM ISZ00005
 TO 105
 RRA YES

This indicates that I should have at least 100 ACBs available.

But, I found that some of the 64 userids have more than one ACB for this app. So, I think that would account for all 105 being in use. For example, this user has 4 ACBs:

 ISZ0301I USER userid user_qualifier NODE nodename PROFILE profilename termtype termid
 ISZ0320I (10) IMS ONLINE1 ACB ISZ00084 LGMD D4A32792 status ACT S( ),P( )
 ISZ0320I (9) IMS ONLINE1 ACB ISZ00057 LGMD D4B32792 status ACT S( ),P(  )
 ISZ0320I (12) IMS ONLINE1 ACB ISZ00103 LGMD D4B32792 status ACT S( ),P( )
 ISZ0320I (11) IMS ONLINE1 ACB ISZ00102 LGMD D4A32792 status ACT S( ),P( )

I just want to confirm that this is valid for one user to have multiple ACBs to the same app. If so, do I need to expand the ACB range to accommodate more sessions?