I do not have access to the builder, I think I have an older version of MM, however, on my parent biz obj, I have these set:
lallowselectall = .t.
lautoprimarybizobj = .t.
lprimarybizonj = .t.
lrequerychildonrequeryparent = .t.
lrequerychildonsaveparent = .t.
lsavechildonsaveparent = .t.
nrequerytype = 0

Yes, when I step thru the debugger, I get into the save method, but the child record is not in the table until I close the parent form.