Yes!!!!!! Stefan, you're right!
Through the GUI one has to do a restore subdirectories to restore the ACL's. In 
fact it's very briefly stated in the OS/2 client installation manual. This is 
an important issue for our recovery manuals!
I however still do not understand why the readme file says that ADSM has to be 
configured as a LanServer administrator. But who cares, it works!
Thank you all very much for your support!
Kind regards,
Eric van Loon