EntireX Broker 721 using WAL813 fails with SOC4 MPM00-ERROR,

Upgraded Adabas from 743 to 813
For EntireX 721 steplibrary WAL, should I use the old WAL743 or the new WAL813? My concern is module ADALNK.

WAL743.

Better yet, since EXX721 is out of support, upgrade to EXXv73 or EXXv80