What parameter of the select function should be set to get the data from the cycle?
To refer to a cycle from a table outside the cycle, you need to specify the cycle number in the cycle parameter:
=: select(table: 'table_in_cycle'; cycle: #cycle_id; field: 'field')
When can I not use the cycle in select functions?
If you refer inside a cycle from the cycle table from the cycle row. In this case, cycle is automatically substituted by the totem.
How do I know the cycle number?
Cycle number is the #id of the row in the cycles table.
If you are inside a cycle table, you can get the variable number using $#nci (now cycle id).
=: listSum(list: $list)
list: selectList(table: 'payments'; field: 'summ'; where: 'order' = $#nci)