I put together a new form based on the projects bizobjform class, added a KMoverObj, set all the appropriate stuff per the Dev Guide.

During testing, I tried to close the form before saving changes. (What, your users never do that? <g>)
QueryUnload called Thisform.oBizObj.IsChanged(tlCurrentRecord).
oBizObj was 'SelListObj', and SelListObj has no LPARAMETERS statement in the IsChanged method, so it threw an error.

My workaround was to add 'LPARAMETERS tlCurrentRecord' and let the parameter die there. It was always .F. because SelListObj works on its own array & arraybackup rather than current record.