I did find documentation of migrating from xoops >= 2.0.14 (mine 2.0.17) to XCL but only found this:
http://xoopscube.org/modules/xhnewbb/viewtopic.php?topic_id=119&viewmode=flatI just found it is a desperate trouble to move from 2.0.17 to XCL. So i take ICMS.